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  • COMMUNICATIONS  (1,377)
  • 1970-1974  (1,377)
  • 1950-1954
  • 1935-1939
  • 1925-1929
Collection
Keywords
Years
Year
  • 1
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    Antenna drive system for the Nimbus satellite (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A two-axis drive system is described for pointing a high gain antenna. Motion about each axis is provided by identical drive mechanisms. Only three gear passes are required to obtain the necessary 900:1 gear reduction. The drive system is a primary element of an experiment that will provide a real time data link between Nimbus and ground stations. Data are transmitted from Nimbus to the applications technology satellite, which relays the data to ground stations.
    Keywords: COMMUNICATIONS
    Type: NASA. Ames Res. Center 6th Aerospace Mech. Symp.; p 117-120
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  • 2
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    The Intelsat 4 antenna positioner (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The Intelsat 4 communications satellite has two spot beam antennas which are pointed to selected land masses by gimbaled positioners. The positioners employ drive motors with electromagnetic brakes and jackscrews that are self-caging during the launch. The positioner uses dry lubricants for ball bearings, spur gears, screw and nut, and various journal bearings. A coefficient of friction of approximately 0.05 was demonstrated in vacuum operation. Success of the positioner was demonstrated on the first Intelsat 4 placed in orbit in January 1971. The developmental problems that were encountered and their solutions are discussed.
    Keywords: COMMUNICATIONS
    Type: NASA. Ames Res. Center 6th Aerospace Mech. Symp.; p 109-116
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  • 3
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    Locations of solar radio bursts (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Measurements of the positions of the sources of solar radio bursts at decameter wavelengths, 20- to 60-MHz range, provide information about physical conditions in a region of the corona extending from about one-half to several solar radii from the surface of the sun. Position measurements in the 20- to 60-MHz range were made with the Clark Lake sweep-frequency grating interferometer. Although the resolution of the instrument is sufficient to measure source position accurately, the highly variable effect of refraction in the earth's ionosphere severely limits the observations, distorting position determinations to such an extent as to make much of the position data useless unless ionospheric refraction can be taken into account. A method was developed for the removal of the refractive effect from the data to permit determination of true source position. With this technique it is considered possible to measure spatial extent of radio sources that will provide information about emission processes and physical parameters in the corona.
    Keywords: COMMUNICATIONS
    Type: Significant Accomplishments in Sci., 1970; p 149-153
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  • 4
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    Reduction of near-in sidelobes using phase reversal aperture rings (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A technique is described for reducing near-in sidelobes in spacecraft antennas by cancellation. This technique takes a small portion of the radiation from the antenna aperture and generates the near-in lobes, which are then fed out of phase relative to the main signal. Results of sample cases indicate that the first three lobes can be nearly eliminated at a 40% reduction in aperture efficiency.
    Keywords: COMMUNICATIONS
    Type: JPL Quart. Tech. Rev., Vol. 1, No. 4; p 34-42
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  • 5
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    Electromagnetic compatibility fundamentals applied to spacecraft radio communication systems (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A design guide for minimizing electromagnetic interference in aerospace communication equipment for ground stations is presented. Specifically treated are the mechanisms of generating unwanted radio emissions that may affect station operations as well as other communications services, the mechanisms by which sensitive receivers become susceptible to interference, means for reducing interference, standard methods of measurement, and the problems of site selection. The sources of interference are viewed primarily as originating from communications transmitters aboard spacecraft and aircraft, ground transmitters within and outside the ground stations, and other electrical sources on the ground that are not intended to radiate.
    Keywords: COMMUNICATIONS
    Type: NASA. Goddard Space Flight Center Radio Freq. Interference Handbook; p 1-106
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  • 6
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    Experiment T001: Entry communication on the Gemini 3 mission (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Water addition to the Gemini 3 exhaust plasma was studied to determine its effectiveness in the establishment of communication links during the entry portion of the flight. Attenuation levels were measured with and without water injection at uhf frequencies of 230.4 and 296.8 megahertz and at the C-band frequency of 5690 megahertz. Ultrahigh frequency signals that had been blacked out were restored to significant levels, during early portions of the water-injection sequence, by the high flow rate injection. The C-band signal was enhanced by medium and high flow rate injections during the latter portion of the injection period. The uhf signal recovered during water injection resulted in an antenna pattern that was beamed in the radial direction of injection from the spacecraft. Postflight analysis showed that the uhf recovery data were consistent with injection-penetration theory.
    Keywords: COMMUNICATIONS
    Type: The Gemini Porgram: Phys. Sci. Expt. Sum.; p 471-485
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  • 7
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    Investigations on a cylindrical antenna as a diagnostic probe for isotropic and magnetized plasmas (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Impedance behavior of short cylindrical antenna used as diagnostic probe in isotropic and magnetized plasmas
    Keywords: COMMUNICATIONS
    Type: NASA. LANGLEY RES. CENTER THE ENTRY PLASMA AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 47-56
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  • 8
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    Communications control group assembly - Teletype line switching equipment (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Communications control group teletype line switching equipment for space stations
    Keywords: COMMUNICATIONS
    Type: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 113-116
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  • 9
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    Antenna rigging angle optimization within structural member size design optimization (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Antenna rigging angle optimization within structural member design for improved antenna performance
    Keywords: COMMUNICATIONS
    Type: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 81-87
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  • 10
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    Antenna structures - Evaluation of reflector surface distortions (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Reflector surface distortions of 210 ft antenna and their effects on radio frequency performance
    Keywords: COMMUNICATIONS
    Type: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 76-80
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  • 11
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    Tracking and data acquisition elements research - Polarization diverse S band feed cone (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Polarization diverse S band feed cone for DSIF reflector antennas
    Keywords: COMMUNICATIONS
    Type: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 66-72
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  • 12
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    A second/third order hybrid phase locked receiver for tracking Doppler rates (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Second/third order hybrid phase locked receiver for tracking frequency ramp signals
    Keywords: COMMUNICATIONS
    Type: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 42-45
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  • 13
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    Refractivity influence on DSS Doppler data (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Examination of deep space Doppler data for terrestrial media contamination
    Keywords: COMMUNICATIONS
    Type: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 31-41
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  • 14
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    The effects of spatial nonuniformities on high temperature microwave breakdown (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Effects on high temperature microwave antenna breakdown of ionization frequency, collision frequency, diffusion coefficient, and breakdown parameters
    Keywords: COMMUNICATIONS
    Type: NASA. LANGLEY RES. CENTER THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 489-508
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  • 15
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    An automatic antenna impedance matcher for reentry vehicle applications (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Impedance matcher for automatically maximizing power radiated from X band antenna on reentry vehicle by eliminating power dissipated as heat
    Keywords: COMMUNICATIONS
    Type: NASA. LANGLEY RES. CENTER THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 449-463
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  • 16
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    Electromagnetic wave propagation in a lossy plasma slab with a gradient transverse to the incident wave (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Computer solution of plane electromagnetic wave interaction with bounded inhomogeneous plasma slab with electron density gradient transverse to wave
    Keywords: COMMUNICATIONS
    Type: NASA. LANGLEY RES. CENTER THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 427-448
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  • 17
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    Radiation from circumferential slots on plasma-clad cones (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Slot antenna radiation pattern distortion produced by boundary layer plasma sheath around conical reentry vehicles
    Keywords: COMMUNICATIONS
    Type: NASA. LANGLEY RES. CENTER THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 411-425
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  • 18
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    Antenna performance in the presence of a turbulent plasma (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Antenna radiation patterns and electron density profiles in turbulent plasma flow
    Keywords: COMMUNICATIONS
    Type: NASA. LANGLEY RES. CENTER THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 379-410
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  • 19
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    Effects of reentry plasma on RAM C-1 VHF telemetry antennas (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Reentry plasma effects on RAM C-1 VHF telemetry antenna radiation patterns
    Keywords: COMMUNICATIONS
    Type: THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 183-201
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  • 20
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    Shock tube measurement of admittance of RAM C and RAM C-C diagnostic antennas (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Shock tube measurements of admittance of RAM C-2 and RAM C-3 diagnostic antenna admittance to analyze accuracy of calculated electron density
    Keywords: COMMUNICATIONS
    Type: THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 157-182
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  • 21
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    RAM C-3 S-band diagnostic experiment (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: RAM C-3 S band diagnostic antenna systems and calculations of electron density profiles
    Keywords: COMMUNICATIONS
    Type: THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 137-155
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  • 22
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    Communications system research (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Coding, synchronization, combinatorial, multiple access, propagation, and permutation studies for telecommunications systems
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-61, VOL. 3 28 FEB. 1970; P 25-89
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  • 23
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    Television experiment (1973)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The fixed and variable Martian features investigated by the TV experiment on Mariner 9 are described. Articles are presented concerning the dust storm of October to November over the Southern Hemisphere; global surface geodesy and cartography; geology; and the satellite astronomy.
    Keywords: COMMUNICATIONS
    Type: Mariner Mars 1971 Proj., Vol. 5; p 63-70
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  • 24
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    The Goddard helical tape recorder (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A spacecraft recorder was developed with the objective of functioning continuously for 5 years. The resulting design employed a metallic tape wound in a 200-turn helix. A direct drive, brushless dc torquer and servo speed control drove the recorder at 3 rpm for recording and 54 rpm for playback.
    Keywords: COMMUNICATIONS
    Type: 6th Aerospace Mech. Symp.; p 89-93
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  • 25
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    Bias and spread in extreme value theory measurements of probability of error (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Extreme value theory is examined to explain the cause of the bias and spread in performance of communications systems characterized by low bit rates and high data reliability requirements, for cases in which underlying noise is Gaussian or perturbed Gaussian. Experimental verification is presented and procedures that minimize these effects are suggested. Even under these conditions, however, extreme value theory test results are not particularly more significant than bit error rate tests.
    Keywords: COMMUNICATIONS
    Type: JPL Quart. Tech. Rev., Vol. 1, No. 4; p 58-68
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  • 26
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    The use of the Earth-Moon system as a radio tracking facility (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The use of the earth-moon system for radio tracking has several potentially useful aspects, from a scientific standpoint: extension of the baseline by two orders of magnitude, absence of lunar atmosphere, higher-velocity parallax with a longer period, and the moon's more modellable rotation. The facility would be a convenient base station for other research, not directly involving the tracking capability, but utilizing its orbiting data link features.
    Keywords: COMMUNICATIONS
    Type: Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 249-251
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  • 27
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    Radio tracking with the Deep Space Network (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Range and Doppler measurements for the Mariner 6 and 7 spacecraft are described. The Doppler tracking system and the two systems of spacecraft ranging apparatus being used in the Deep Space Network are illustrated. Charged particle calibration is considered. Equipment characteristics are presented for the ranging apparatus.
    Keywords: COMMUNICATIONS
    Type: Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 158-165
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  • 28
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    Experiment Do14: Ultrahigh and very high frequency polarization (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The measurement of inhomogeneities in the electron content along the orbital paths of Gemini 8 and Gemini 9 missions was not accomplished because the tracking information was not available. The use of ultrahigh frequency radio transmission was the primary factor in the successful removal of a very high frequency Faraday rotation ambiguity; but, as was expected, this was not very useful for fine-scale polarization studies. Ionosonde data were useful in the computation of the slab thickness at the closest point of approach of the spacecraft.
    Keywords: COMMUNICATIONS
    Type: NASA. Manned Spacecraft Center The Gemini Program: Phys. Sci. Expt. Sum.; p 487-507
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  • 29
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    Spacecraft telecommunications systems - A digital command system development (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: All digital, single channel command subsystem for spacecraft communication
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-61, VOL. 3 28 FEB. 1970; P 126-129
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  • 30
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    Applied mechanics (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Spacecraft antenna optimization, receptance coupling program, deformation modes and dynamic response of structures, and holographic measurements
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-61, VOL. 3 28 FEB. 1970; P 171-190
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  • 31
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    Calibration of radar data from Apollo 16 results, part X (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Predictions of surface and near surface blockiness using earth based radar measurements were made. Two polarizations of the radar echoes were measured - polarized and depolarized. Particular attention was given to the depolarized echoes. North Ray and South Ray Craters and a 512-m diameter lunar crater in the Flamsteed Ring were used for the study.
    Keywords: COMMUNICATIONS
    Type: NASA. Lyndon B. Johnson Space Center Apollo 16 Prelim. Sci. Rept.; 3 p
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  • 32
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    Bistatic-radar investigation (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The purpose of the reported experiment was to determine the principal electromagnetic and structural properties of the lunar surface from the observation of command and service module (CSM) radio transmissions that were reflected from the lunar surface and received on earth. These transmissions emanate from the CSM communication systems at wavelengths of 13 cm (S-band) and 116 cm (very high frequency (VHF)). Lunar crustal properties such as dielectric constant, average slope and slope probability, density, small-scale surface roughness, and embedded rocks to a depth of 20 m may be determined. The results are proving to be most useful in understanding the processes that have produced and modified the crust and in distingushing between adjacent and subjacent geological units. The experimental observations are also of intrinsic interest in the study of electromagnetic scattering.
    Keywords: COMMUNICATIONS
    Type: NASA. Lyndon B. Johnson Space Center Apollo 16 Prelim. Sci. Rept.; 13 p
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  • 33
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    Electromagnetic compatibility design guideline for STADAN (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Procedures for achieving electromagnetic compatibility in electronic and electrical equipment for aerospace ground stations are investigated. The application of shielding theory to good design is treated and standards of good practice are outlined for bonding, grounding, wiring, and cabling. Some aspects of filter design are explained, and suggestions are given for the application of filters to electronic and electrical equipment.
    Keywords: COMMUNICATIONS
    Type: NASA Goddard Space Flight Center Radio Freq. Interference Handbook; p 107-198
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  • 34
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    Overview of the AF Avionics Laboratory reentry electromagnetics program (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Radio wave propagation through plasmas studied for communication with hypersonic vehicles during reentry
    Keywords: COMMUNICATIONS
    Type: NASA. LANGLEY RES. CENTER THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 3-17
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  • 35
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    Communications elements research (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Components and techniques for radio and optical space communication
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-61, VOL. 3 28 FEB. 1970; P 90-120
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  • 36
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    Spacecraft radio - TOPS radio frequency subsystem (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Radio frequency subsystem requirements and estimated reliability data for Thermoelectric Outer Planet Spacecraft
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-61, VOL. 3 28 FEB. 1970; P 121-125
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  • 37
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    Evolution of a spacecraft antenna system (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Mechanically despun antenna system design for spin stabilized spacecraft used in ATS and Intelsat systems
    Keywords: COMMUNICATIONS
    Type: JPL PROC. OF THE 4TH AEROSPACE MECH. SYMP. 15 JAN. 1970; P 13-18
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  • 38
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    Radar augmentation device (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The radar augmentation device (RAD) serves to increase the radar response of a target body and thus expedite radar acquisition. The design and development of the RAD are discussed with particular emphasis on technical problems that were encountered and solved. Discussions of the mode of operation of the RAD and the ground test history are also included.
    Keywords: COMMUNICATIONS
    Type: NASA. Ames Res. Center 6th Aerospace Mech. Symp.; p 65-72
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  • 39
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    Magnetospheric radio noise (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Observations, made by the RAE satellite, of earth magnetospheric noise are reported. The observations show radio noise exists at 700 kHz and below. The results are included in graphs.
    Keywords: COMMUNICATIONS
    Type: Significant Accomplishments in Sci., 1970; p 75-80
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  • 40
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    Structure of proton centers and associated nonthermal bursts at microwave frequencies (1973)
    In:  CASI
    Details
    Publication Date: 2006-04-05
    Description: A very broad band of electromagnetic radiation is emitted during solar flares, especially at the explosive phase. The existence of a large variety of plasmas with various densities and a wide range of temperatures or energies is proposed as the initiating agent. The manner in which the plasmas are heated and accelerated to subrelativistic and relativistic energies is discussed. Observational evidence on the characteristics of active regions which produced proton flares and on the structure of the associated nonthermal microwave bursts of the sun is presented. The behavior of subrelativistic electrons on the sun is described.
    Keywords: COMMUNICATIONS
    Type: NASA, Washington High Energy Phenomena on the Sun; p 78-86
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  • 41
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    Vibration resistance of the wire-feed mechanism of a magnetic recording apparatus (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: The effects of external mechanical and climatic actions on the efficient operation of magnetic tape recording equipment are analyzed. The efficiency and reliability of the recording system are determined by the structural parameters and the characteristics of the individual elements of the transport mechanism circuit. The resistance of tape recording equipment to the effects of vibration is considered essential for reliable operations. Methods for insuring reliable tape transport and recording action are discussed.
    Keywords: COMMUNICATIONS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 271-274
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    Measurement of irregularities in angular velocities of rotating assemblies in memory devices on magnetic carriers (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: Problems in measurement of irregularities in angular velocity of rotating assemblies in memory devices with rigid and flexible magnetic data carriers are discussed. A device and method for determination of change in angular velocities in various frequency and rotation rate ranges are examined. A schematic diagram of a photoelectric sensor for recording the signal pulses is provided. Mathematical models are developed to show the amount of error which can result from misalignment of the test equipment.
    Keywords: COMMUNICATIONS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 279-282
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  • 43
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    Error analysis of bent ray radio occultation measurments (1972)
    In:  CASI
    Details
    Publication Date: 2006-03-12
    Description: There are two types of experimental measurement errors of the Doppler data associated with the radio occultation, random and systematic. Random errors are due to thermal noise in the transmission channel, and the phase lock loop, and quantization error in the digital circuitry. These are called noise type errors. The systematic errors are due to geometric uncertainty and equipment phase instability. Considered is the amount of uncertainty, due to random measurement errors, in the refractivity profiles reconstructed by this type of indirect sensing experiment. A class of refractivity profiles is defined which approximately fit the set of measured data. Bounds are placed on the extent of this class of solution profiles. To accomplish this, the sensivity of the reconstructed refractivity profiles to errors in the measured quantity and the statistics of the errors in the measurement are examined.
    Keywords: COMMUNICATIONS
    Type: NASA. Ames Res. Center Math. of Profile Inversion; 5 p
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  • 44
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    Some special cases of the electromagnetic inverse problem (1972)
    In:  CASI
    Details
    Publication Date: 2006-03-12
    Description: A review of exact techniques for determining the surface of a three-dimensional perfectly conducting body is given, followed by some new results on the uniqueness question concerning the number of measurements that may be required to explicitly determine the surface of the body. It is then shown that the inhomogeneous but spherically symmetric dielectric electromagnetic case is reducible to a scalar inverse problem that can be treated by known techniques.
    Keywords: COMMUNICATIONS
    Type: NASA. Ames Res. Center Math. of Profile Inversion; 11 p
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  • 45
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    Spacecraft ion beam noise effects (1972)
    In:  CASI
    Details
    Publication Date: 2006-02-22
    Description: An estimate of the antenna noise temperature and the uplink signal-to-noise ratio has been made for Bremsstrahlung radiation emitted by a spacecraft ion beam; a worst-case situation in which the spacecraft antenna is located in the exit plane of the ion beam and directed at varying angles into the ion beam is assumed. Numerical results of the antenna noise temperature versus antenna pointing angle are given for a typical set of ion beam and antenna pattern parameters. The uplink signal-to-noise ratio due to the ion beam noise alone is given in terms of a critical range in AU at which a typical ranging transmission is received with S/N = 0 db. The effects of the ion beam divergence angle and antenna distance on the ion beam are also presented. Results of the study show typical increases in the antenna noise temperature of about 0.2 K and critical ranges of the order of 3-5 AU. An ion engine thus generally introduces an undetectable level of noise into a spacecraft receiver.
    Keywords: COMMUNICATIONS
    Type: JPL Quart. Tech. Rev., Vol. 2, No. 2; p 61-71
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  • 46
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    Interplex: An analysis of optimized power allocations for two and three channel PSK/PM telecommunications systems (1972)
    In:  CASI
    Details
    Publication Date: 2006-02-22
    Description: Optimal design concepts are presented for two- and three-channel telemetry modes in the context of the Mariner Venus-Mercury 1973 mission and the usefulness of interplex modulation techniques is discussed. These ideas are applied as an example to one Mariner Venus-Mercury 1973 telemetry mode to demonstrate that interplex can reduce the required total average power by more than 2 dB in some cases.
    Keywords: COMMUNICATIONS
    Type: JPL Quarterly Tech. Rev., Vol. 2, No. 1; p 143-151
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  • 47
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    Analysis of the failure of a polyester peripheral drive belt on the Mariner Mars 1971 flight tape recorder (1972)
    In:  CASI
    Details
    Publication Date: 2006-02-22
    Description: A peripheral drive belt on the Mariner Mars 1971 tape recorder failed when a thin longitudinal strip separated off one edge. Analysis showed that the most probable cause of failure occurred from flexural fatigue initiating in mechanically weak locations which are introduced into the belt during fabrication. Methyl ethyl ketone, which is employed as a cleaning solvent during fabrication, was found to cause permanent reduction in engineering properties of polyester and could have contributed to the reduction of the fatigue resistance. Fatigue properties of the polyester drive belt are reviewed for the operating condition, as well as the sensitivity of polyester to cleaning solvents and the origin of mechanically weak locations.
    Keywords: COMMUNICATIONS
    Type: JPL Quarterly Tech. Rev., Vol. 2, No. 1; p 82-99
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  • 48
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    Studies on the frictional behavior of magnetic recording tapes (1972)
    In:  CASI
    Details
    Publication Date: 2006-02-22
    Description: Methods were developed for measuring frictional forces acting on a magnetic tape in motion or at rest, as well as the extent of stick slip. The effects of factors such as temperature, humidity, kind of gaseous atmosphere, and tape speed on the frictional interaction between various tapes and heads were investigated. Results were instrumental in the selection of a tape for the Mariner Mars 1971 spacecraft. Studies are reported on the stick slip behavior of tapes and the performance of a metallic tape, compared with the usual plastic tapes.
    Keywords: COMMUNICATIONS
    Type: JPL Quarterly Tech. Rev., Vol. 2, No. 1.; p 100-106
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  • 49
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    Preliminary antenna radiation pattern calculations for the ATS F flex rib reflector (1970)
    In:  CASI
    Details
    Publication Date: 2006-04-25
    Description: Computer program for calculating radiation pattern of ATS 6 flexible rib-reinforced reflector
    Keywords: COMMUNICATIONS
    Type: NIFICANT ACCOMPLISHMENTS IN SCI. AND TECHNOL. AT GODDARD SPACE FLIGHT CENTER 1970; P 259-262
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  • 50
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    Apollo slow scan TV signal enhancement (1970)
    In:  CASI
    Details
    Publication Date: 2006-04-25
    Description: Amplifier gain control for Apollo scan television signal enhancement
    Keywords: COMMUNICATIONS
    Type: NIFICANT ACCOMPLISHMENTS IN SCI. AND TECHNOL. AT GODDARD SPACE FLIGHT CENTER 1970; P 344-349
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  • 51
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    Results from simultaneous radar-television observations (1972)
    In:  CASI
    Details
    Publication Date: 2006-04-24
    Description: The results of the reduction of simultaneous observations of 29 meteors are presented in tabular form. Fragmentation of the observations is discussed along with the 50 meteors not yet reduced.
    Keywords: COMMUNICATIONS
    Type: Meteor Res. Program; p 83-99
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  • 52
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    Analysis procedure for television observations and simultaneous observations (1972)
    In:  CASI
    Details
    Publication Date: 2006-04-24
    Description: The procedures used in the analysis of television and simultaneous observations are described. Starting with the right ascension and declination of the meteor, the celestrial triangle formed by Sidell and the meteor is solved, and the epochs of the beginning and end of the meteor observation as recorded on the video tape are determined.
    Keywords: COMMUNICATIONS
    Type: Meteor Res. Program; p 69-76
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  • 53
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    Simultaneous observations by television camera and radar (1972)
    In:  CASI
    Details
    Publication Date: 2006-04-24
    Description: The original image-orthicon equipment used for simultaneous radar and optical observations is described. The adaptations made to enhance its usefulness for meteor observations, and the specialized calibration and photometric procedures developed for this purpose are also described. Some brief comments concerning the use of the secondary electron conduction vidicon are included.
    Keywords: COMMUNICATIONS
    Type: Meteor Res. Program; p 29-36
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  • 54
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    Experimental analysis of mercury cadmium telluride photovoltaic IR mixers for spacecraft receivers (1970)
    In:  CASI
    Details
    Publication Date: 2006-04-25
    Description: Performance of mercury cadmium telluride photovoltaic infrared mixer for ATS 6 carbon dioxide laser communication system
    Keywords: COMMUNICATIONS
    Type: NIFICANT ACCOMPLISHMENTS IN SCI. AND TECHNOL. AT GODDARD SPACE FLIGHT CENTER 1970; P 272-274
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  • 55
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    Results of measurement of radio wave absorption in the ionosphere by the AI method (1972)
    In:  CASI
    Details
    Publication Date: 2006-04-26
    Description: Median noon absorption values for each month from 1964 through 1967, the diurnal variations of absorption on the regular world days, and the seasonal variations of absorption are given. The dependence of the absorption coefficient on sunspot number is analyzed.
    Keywords: COMMUNICATIONS
    Type: Morphology of the Quiet and Disturbed Ionosphere; p 99-112
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  • 56
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    Analysis procedure for radar observations (1972)
    In:  CASI
    Details
    Publication Date: 2006-04-24
    Description: Based on the assumption that the ionized column left behind a moving meteroroid is underdense, it is shown that radar observations of the column yield resonable aproximations to the meteoriod's speed and trajectory. The principles and procedures for finding a meteor's position and vector velocity from the observed data are also presented.
    Keywords: COMMUNICATIONS
    Type: Meteor Res. Program; p 51-68
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  • 57
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    Antenna calibration at Havana (1972)
    In:  CASI
    Details
    Publication Date: 2006-04-24
    Description: The procedures for calibrating the antenna patterns of the Havana radar system are described along with the reduction of the measurements made using a dipole towed behind an airplane. The power-gain pattern for the north, south, and joint troughs of sites 3 and 4 are plotted.
    Keywords: COMMUNICATIONS
    Type: Meteor Res. Program; p 37-50
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  • 58
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    Description of eight station radar near Havana, Illinois (1972)
    In:  CASI
    Details
    Publication Date: 2006-04-24
    Description: A general description is given of the eight-station system at Havana which incorporated high-gain antennas and a powerful transmitter to reach faint meteors on the order of magnitude of plus 12. The station location, principle of system design, systems connections, transmitter, receivers, logics, range measurement, and recording are described.
    Keywords: COMMUNICATIONS
    Type: Meteor Res. Program; p 19-27
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  • 59
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    A high resolution study in time, position, intensity, and frequency of a radio event on 14 January 1971 (1973)
    In:  CASI
    Details
    Publication Date: 2006-04-05
    Description: High resolution position and spectrum measurements were made of a complex solar radio activity on January 14, 1971, from 1120 to 1130 UT. Positions were measured with 169 MHz Nancay E-W Radioheliograph, while dynamic spectra and polarization were observed with the 60-channel radiospectrograph of Nera. The radio event consisted of two closely similar groups of type 3 bursts and type 2-like details, and a stationary type 4 continuum, including some very clear pulsating structures. The general aspect of this activity is presented.
    Keywords: COMMUNICATIONS
    Type: NASA, Washington High Energy Phenomena on the Sun; p 610-614
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  • 60
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    Solar millimeter bursts (1973)
    In:  CASI
    Details
    Publication Date: 2006-04-05
    Description: Solar burst observations in the region above 10 GHz (wavelengths less than 3 cm.) are discussed. Observations have shown that many major solar events have large millimeter wave components. The total burst radio energy is frequently concentrated in this part of the spectrum. Graphs are presented showing the peak flux density spectrum for bursts on specific dates. Microwave burst mean duration is plotted as a function of the particle energy.
    Keywords: COMMUNICATIONS
    Type: NASA, Washington High Energy Phenomena on the Sun; p 114-123
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  • 61
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    Radio communications with extra-terrestrial civilizations (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Communications between civilizations within our galaxy at the present level of radio engineering is possible, although civilizations must begin to search for each other to achieve this. If an extra-terrestrial civilization possessing a technology at our level wishes to make itself known and will transmit special radio signals to do this, then it can be picked up by us at a distance of several hundreds of light years using already existing radio telescopes and specially built radio receivers. If it wishes, this civilization can also send us information without awaiting our answer.
    Keywords: COMMUNICATIONS
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 79-82
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  • 62
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    Intermediate memory devices (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Several methods of transfer and processing of data whose practical implementation requires operational memory devices are described. Devices incorporating multistable elements are proposed and their main parameters are given. The possibility of using the proposed devices for storing information for transmission in space radio communications channels is examined.
    Keywords: COMMUNICATIONS
    Type: Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 155-162
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  • 63
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    Electromagnetic processes in the atmosphere of pulsars (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The work consists of two parts. The first deals with the fine structure of radio pulses. Based on kinetic theory, processes occurring in the plasma shell of a pulsar when external electromagnetic radiation is present are investigated. It is shown that electromagnetic waves cause electrons to drift relative to ions, and initiate longitudinal oscillations. A dispersion equation describing the longitudinal oscillations in magnetized plasma is derived. Conditions for excitation of oscillations are found. Correlation functions of electron density are calculated, along with the coefficients of electromagnetic wave scattering. It is shown that variations in the amplitude of pulsar pulses are associated with scintillations caused by fluctuations in the plasma electron density. The second part of the study presents a mechanism for the radio emission of pulsars. The model of a rotating and a pulsating star, a neutron star with dipolar or more complex magnetic field, is examined.
    Keywords: COMMUNICATIONS
    Type: Space Res. in the Ukraine, No. 3, (NASA-TT-F-15537); p 44-53
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  • 64
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    The tropospheric calibration model for Mariner Mars 1971 (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The effects of the troposphere on arrival time, range, and range rate measurement of radio signals propagating from spacecraft are examined. A tropospheric calibration model which takes into account seasonal variations, various elevations, and apparent location changes was developed. A comparison was made of the effects before and after calibration. Without calibration, a 16-m change in the distance off the spin axis, is induced for a 10-deg minimum elevation symmetrical pass. Even after calibration with the old model, the error in spin axis is still greater than 1 m. Calibration results and estimated uncertainties of the model are given in tabular form. Test results also show that the model met the required accuracy for the Mariner Mars 1971 mission.
    Keywords: COMMUNICATIONS
    Type: Tracking System Analytic Calibration Activities for the Mariner Mars 1971 Mission; p 61-76
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  • 65
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    Comparison between photogrammetric and bistatic-radar slope frequency distributions (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: A comparison was made of the results for lunar surface roughness estimates and slope frequency distributions obtained by using photogrammetric techniques with those obtained by using bistatic radar. Three topics were discussed: (1) the form of the slope frequency distributions, (2) the change of roughness estimates of the lunar surface with scale, and (3) the magnitude of surface roughness.
    Keywords: COMMUNICATIONS
    Type: NASA. Johnson Space Center Apollo 17 Prelim. Sci. Rept.; 9 p
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  • 66
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    Calibration of radar data from Apollo 17 and other mission results (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: An examination was made of radar data on depolarized radar echoes for the general areas of (1) the Apollo 11, 12, 14, 15, 16, and 17 landing sites, (2) Ranger 7, 8, and 9 impact sites, and (3) the Surveyor 1, 3, 5, and 7 landing sites. These data were then compared with photographic data. Surveyor 6 was excluded because it landed near the center of the lunar disk where echo data are poor. Three problems concerning the echo data are (1) the frequency distributions of echo strengths from site to site, (2) the areal distribution of echoes, and (3) detailed correlation of echoes with the photographs of the Apollo 17 landing area.
    Keywords: COMMUNICATIONS
    Type: NASA. Johnson Space Center Apollo 17 Prelim. Sci. Rept.; 7 p
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  • 67
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    High sensitivity spectral observations in the decametric range (1973)
    In:  CASI
    Details
    Publication Date: 2006-04-05
    Description: High resolution dynamic spectra of solar emissions in the range 80 to 20 MHz are discussed. The major features of observations described are (1) decametric storms, (2) type 3 bursts, and (3) time profile of type 3 bursts.
    Keywords: COMMUNICATIONS
    Type: NASA, Washington High Energy Phenomena on the Sun; p 602-609
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  • 68
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    Solar radio bursts at kilometer wavelengths (1973)
    In:  CASI
    Details
    Publication Date: 2006-04-05
    Description: The potential value of traveling solar radio bursts for investigating energetic particle propagation, and for probing the interplanetary medium is discussed. A general survey of the characteristics of type 3 radio phenomena observed at hectometer and kilometer wavelengths is presented along with a brief discussion of the relationships among type 1 meter noise storms, decametric continuum, and type 3 hectometric storms. Type 3 bursts are analyzed to show how these data provide information about the average energy, dispersion, and trajectory of energetic particles, the interplanetary scale, and magnetic field configuration. The recent observations of type 2 shock wave phenomena at kilometer wavelengths are described, and current research and the direction of future observation are outlined.
    Keywords: COMMUNICATIONS
    Type: High Energy Phenomena on the Sun; p 519-536
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  • 69
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    A method of diagnostics of the dynamic stability of the carrier in a magnetic recording playback circuit (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: Graphical plotting of the dynamic instability is used to diagnose carrier behavior according to a given carrier tension fluctuation spectrum.
    Keywords: COMMUNICATIONS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 107-109
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  • 70
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    Verification of performance of the Mariner 9 television cameras (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-27
    Description: Based on limited data, the Mariner 9 performance appears consistent throughout its mission. Several corrections have been provided by inflight verification sequences. A change in photometric response, which will impair precise photometric analysis, has been observed. Hence, only qualified photometric measurement appears feasible under limited conditions. Conversely, certain geometric and electronic parameters appear both measurable and congruent with preflight prediction. The role of inflight verification has been emphasized by these data to assess the in situ camera health and to promote efficient data analysis and interpretation.
    Keywords: COMMUNICATIONS
    Type: Mariner Mars 1971 Proj., Vol. 4; p 499-510
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  • 71
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    Precision signal power measurement (1972)
    In:  CASI
    Details
    Publication Date: 2006-02-22
    Description: Accurate estimation of signal power is an important Deep Space Network (DSN) consideration. Ultimately, spacecraft power and weight is saved if no reserve transmitter power is needed to compensate for inaccurate measurements. Spectral measurement of the received signal has proved to be an effective method of estimating signal power over a wide dynamic range. Furthermore, on-line spectral measurements provide an important diagnostic tool for examining spacecraft anomalies. Prototype equipment installed at a 64-m-diameter antenna site has been successfully used to make measurements of carrier power and sideband symmetry of telemetry signals received from the Mariner Mars 1971 spacecraft.
    Keywords: COMMUNICATIONS
    Type: JPL Quart. Tech. Rev., Vol. 2, No. 2; p 18-24
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  • 72
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    Millimeter wavelength observations of solar active regions (1973)
    In:  CASI
    Details
    Publication Date: 2006-04-05
    Description: Polarization properties of active regions at 9 mm are discussed, and the observed degree of polarization is used to obtain an estimate of chromospheric magnetic fields. Also discussed is the polarization structure at 9 mm of an active region that produced a minor flare around 1900 UT on September 28, 1971. Total power observations indicate that new regions develop, or weak regions intensify at millimeter wavelengths as a result of bursts at distant sites. The spectra of the peak flux density of moderately strong bursts observed at 9 mm show a sharp drop toward the shorter millimeter wavelengths. The weak bursts at 3.5 mm are manifest mainly as heating phenomena.
    Keywords: COMMUNICATIONS
    Type: NASA, Washington High Energy Phenomena on the Sun; p 104-113
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  • 73
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    Spectral characteristics of microwave bursts (1973)
    In:  CASI
    Details
    Publication Date: 2006-04-05
    Description: Various statistical parameters of the peak flux-density spectra of solar microwave bursts have been examined for 1968 to 1971 based on spectra obtained from fixed-frequency observations at 245, 606, 1415, 2695, 4995, 8800, 15400, and 35000 MHz. For bursts having a centimeter-radiation component, the great majority were found to have type C spectra (single spectral maximum) in the L-band to K-band range. A small percentage had miscellaneous type spectra (more than one spectral maximum) and another small percentage had what might be taken as thermal spectra. Even for gradual rise-and-fall bursts often thought to be thermal origin, less than 20 percent were found to have spectra which could be classified as thermal. The relationship between the burst spectral maximum (f sub max) and the photospheric magnetic field strength of the region associated with the burst was examined. A tendency for greater correlation at higher f sub max for stronger magnetic fields is noted; however, this is over-shadowed by the overall high correlations for those regions having strong photospheric magnetic fields.
    Keywords: COMMUNICATIONS
    Type: NASA, Washington High Energy Phenomena on the Sun; p 87-103
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  • 74
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    Some studies of triggered whistler emissions (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Triggered whistler emissions in magnetosphere, considering nonlinear interaction between whistler wave and resonating particles
    Keywords: COMMUNICATIONS
    Type: ; 331-335. (
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  • 75
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    Time-dependent multiple backscattering (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Time dependent multiple backscattering of pulsed light for linearly polarized incident radiation
    Keywords: COMMUNICATIONS
    Type: ; IBRATIONAL COMBUSTIO
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  • 76
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    Performance of the NASA laser ranging system in satellite tracking (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: NASA pulsed laser ranging systems for scientific satellite tracking, determining accuracy by trajectory and long arc orbital comparison
    Keywords: COMMUNICATIONS
    Type: ; ADEMIE DES SCIENCES
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  • 77
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    Kinetic theory of electromagnetic waves obliquely incident upon a plasma slab (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Kinetic theory of electromagnetic waves obliquely incident upon plasma slab considered as boundary value problem
    Keywords: COMMUNICATIONS
    Type: ; 9-12, 15 (
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  • 78
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    Multiple-mission telemetry (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Progress report, block diagrams, and processing of multiple-mission telemetry of Deep Space Instrumentation Facility
    Keywords: COMMUNICATIONS
    Type: The Deep Space Network, Vol. 4; p 160-164
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  • 79
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    SFOF digital television hardcopy equipment (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: SFOF digital television hardcopy equipment, consisting of system control unit, 12 copy request units, display image buffer, and 12 hardcopy printers
    Keywords: COMMUNICATIONS
    Type: The Deep Space Network, Vol. 4; p 123-128
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  • 80
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    DSN monitor system (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: DSN monitor system changes after using IBM 360/75 computers
    Keywords: COMMUNICATIONS
    Type: The Deep Space Network, Vol. 4; p 11-12
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  • 81
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    DSN functions and facilities (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: DSN functions and facilities, including Deep Space Instrumentation Facility, Ground Communications Facility, and Space Flight Operations Facility
    Keywords: COMMUNICATIONS
    Type: in its The Deep Space Network, Vol. 4; p 1-3
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  • 82
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    GEOS-C radar altimeter (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Design criteria for radar altimeter for GEOS-C geodetic satellite
    Keywords: COMMUNICATIONS
    Type: PROC. OF THE GEOS-2 PROGRAM REV. MEETING, VOL. 4 NOV. 1970; P 281-292
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  • 83
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    AM baseband telemetry techniques (1971)
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    Publication Date: 2011-08-16
    Description: Techniques and circuits used in designing AM highly flexible telemetry system comprising single sideband/double sideband/constant bandwidth compatible system - space application
    Keywords: COMMUNICATIONS
    Type: INSTRUMENTATION AND COMMUN. RES. AT MSFC, VOL. 4 MAY 1971; P 31-41
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  • 84
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    Coding - A tool for the digital telemetry link (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Digital PCM telemetry link coding techniques, discussing encoding-decoding complexity, and concatenated block scheme for channel
    Keywords: COMMUNICATIONS
    Type: ; ADEMIE DES SCIENCES
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  • 85
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    On the equivalence in performance of several phase-locked loop configurations (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Dynamic noise performance equivalence of phase locked or double superheterodyne tracking loops, using noise free external generator
    Keywords: COMMUNICATIONS
    Type: ; ADEMIE DES SCIENCES
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  • 86
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    Millimeter wave propagation measurements from the Applications Technology Satellite /ATS-V/ (1970)
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    Publication Date: 2011-08-16
    Description: Millimeter wave propagation measurements by ATS-5 satellite, observing attenuation dependence on meteorological parameters for communication data link performance prediction
    Keywords: COMMUNICATIONS
    Type: ; YSICA STATUS SOLIDI
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  • 87
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    Adaptive variable-length coding for efficient compression of spacecraft television data. (1971)
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    Publication Date: 2011-08-16
    Description: An adaptive variable length coding system is presented. Although developed primarily for the proposed Grand Tour missions, many features of this system clearly indicate a much wider applicability. Using sample to sample prediction, the coding system produces output rates within 0.25 bit/picture element (pixel) of the one-dimensional difference entropy for entropy values ranging from 0 to 8 bit/pixel. This is accomplished without the necessity of storing any code words. Performance improvements of 0.5 bit/pixel can be simply achieved by utilizing previous line correlation. A Basic Compressor, using concatenated codes, adapts to rapid changes in source statistics by automatically selecting one of three codes to use for each block of 21 pixels. The system adapts to less frequent, but more dramatic, changes in source statistics by adjusting the mode in which the Basic Compressor operates on a line-to-line basis. Furthermore, the compression system is independent of the quantization requirements of the pulse-code modulation system.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Communication Technology; COM-19; Dec. 197
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  • 88
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    Analysis and design of antennas for air traffic collision avoidance systems. (1971)
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    Publication Date: 2011-08-16
    Description: The analysis and design procedure of an antenna for a CW Doppler radar system being developed for pilot warning of midair collision hazards is presented. The antenna consists of two vertical arrays of half-wavelength dipoles mounted near a circular conducting cylinder. Each vertical array is composed of three vertical dipoles. Each array provides relatively uniform illumination (2.3 dB) in the forward 180-deg angular segment of the horizontal plane and approximately plus or minus 10 to 15 deg coverage in the vertical plane. The antenna could be used in a two-mode operation, either in a standard monopulse radar system (sum and difference amplitude patterns) or in a system where amplitude and phase are the measurable quantities.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Aerospace and Electronic Systems; AES-7; Sept
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  • 89
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    Mode coupling in partial reflections from the ionosphere at vertical incidence. (1972)
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    Publication Date: 2011-08-16
    Description: The effect of mode coupling has been calculated for radio waves partially reflected from the lower ionosphere at vertical incidence. Calculations were made for parameters appropriate to the partial reflection experiments (Belrose, 1970). The four reflection coefficients (two direct and two coupled) are calculated for a plane discontinuity using a matrix perturbation analysis. The ratios of coupled to direct reflection coefficients are calculated for a general one-dimensional reflecting layer using the coupled equations of Clemmow and Heading (1954). At the highest electron density considered, 10,000 per cu cm, about 10% of the reflected extraordinary wave amplitude might be due to coupling from the incident ordinary wave. The effect is smaller at lower electron density.
    Keywords: COMMUNICATIONS
    Type: Radio Science; 7; Apr. 197
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  • 90
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    Convergence of oscillator spectral estimators for counted-frequency measurements. (1972)
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    Publication Date: 2011-08-16
    Description: A common intermediary connecting frequency-noise calibration or testing of an oscillator to useful applications is the spectral density of the frequency-deviating process. In attempting to turn test data into predicts of performance characteristics, one is naturally led to estimation of statistical values by sample-mean and sample-variance techniques. However, sample means and sample variances themselves are statistical quantities that do not necessarily converge (in the mean-square sense) to actual ensemble-average means and variances, except perhaps for excessively large sample sizes. This is especially true for the flicker noise component of oscillators. This article shows, for the various types of noises found in oscillators, how sample averages converge (or do not converge) to their statistical counterparts. The convergence rate is shown to be the same for all oscillators of a given spectral type.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Communications; COM-20; Apr. 197
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  • 91
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    Differential phase shift of partially reflected radio waves. (1971)
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    Publication Date: 2011-08-16
    Description: The addition of phase difference measurements to differential absorption experiments is shown to be both feasible and desirable. The phase information can provide a more sensitive measurement of electron density above about 75 km. The differential phase shift is only weakly dependent on collision frequency in this range, and so an accurate collision frequency profile is not a prerequisite. The differential phase shift and differential absorption measurements taken together can provide both electron density and collision frequency data from about 70 to 90 km.
    Keywords: COMMUNICATIONS
    Type: Radio Science; 6; Aug
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  • 92
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    A flexible high-speed sequential decoder for deep space channels. (1971)
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    Publication Date: 2011-08-16
    Description: This paper describes a sequential decoding machine built at the Jet Propulsion Laboratory (JPL), which uses a 3-bit quantization of the code symbols and achieves a computation rate of MHz. This machine is flexible and can be programmed to decode any complementary convolutional code with rates down to 1/4 and constraint lengths up to 32. In addition, metric programmability is provided for optimization of decoder performance with respect to channel parameter variations.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Communication Technology; COM-19; Oct. 197
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  • 93
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    A note on scattering from a slightly rough surface (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Bistatic radar scattering cross section from slightly rough perfectly conducting infinite surface, using Fourier transform
    Keywords: COMMUNICATIONS
    Type: ; ROBLEMS OF THE THEOR
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  • 94
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    Radiation resistance of a small filamentary loop antenna in a cold multicomponent magnetoplasma (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Radiation resistance of small filamentary loop antenna in cold collisionless uniform multicomponent magnetoplasma, assuming uniform current distribution along loop
    Keywords: COMMUNICATIONS
    Type: ; ROBLEMS OF THE THEOR
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  • 95
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    Characteristics of magnetospheric ducts observed by the Alouette 2 topside sounder (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Magnetospheric conjugate ducts characteristics for HF radio propagation from Alouette 2 topside sounder ionograms analysis
    Keywords: COMMUNICATIONS
    Type: ; UG REVUE(
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  • 96
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    Frequency-counted measurements and phase locking to noisy oscillators (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Frequency counted measurements and phase locking to noisy oscillators, showing counted frequency method sample variance slow convergence to actual variance
    Keywords: COMMUNICATIONS
    Type: ; YAL SOCIETY (
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  • 97
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    Frequency interpolation correction for Alouette II ionograms (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Alouette 2 ionograms frequency interpolation correction allowing measurement accuracy comparable to sounder system resolution
    Keywords: COMMUNICATIONS
    Type: ; YAL SOCIETY (
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  • 98
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    Possible observations and mechanism of very long delayed radio echoes (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Beam-plasma mechanism of very long delayed radio echoes from ionosphere
    Keywords: COMMUNICATIONS
    Type: ; ADEMIE DES SCIENCES
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  • 99
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    NASA's use of the radio frequency spectrum in aerospace systems (1970)
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    Publication Date: 2011-08-16
    Description: NASA program concerning determination of RF spectrum sharing criteria and automatic data processing in aerospace systems
    Keywords: COMMUNICATIONS
    Type: ; ADEMIE DES SCIENCES
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  • 100
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    SFOF digital television display subassembly (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: SFOF digital television display subassembly providing continuous television compatible video output
    Keywords: COMMUNICATIONS
    Type: The Deep Space Network, Vol. 4; p 116-122
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