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  • COMMUNICATIONS  (567)
  • 1980-1984
  • 1970-1974  (230)
  • 1965-1969  (337)
  • 1950-1954
  • 1925-1929
  • 1973  (230)
  • 1969  (337)
Collection
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Years
  • 1980-1984
  • 1970-1974  (230)
  • 1965-1969  (337)
  • 1950-1954
  • 1925-1929
Year
  • 1
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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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  • 2
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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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  • 3
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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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  • 4
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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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  • 5
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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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  • 6
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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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  • 7
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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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  • 8
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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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  • 9
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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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  • 10
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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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  • 11
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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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  • 12
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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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  • 13
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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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  • 14
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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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  • 15
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    Discussion of Hallenbeck paper (1969)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Technology trends in news magazine publishing
    Keywords: COMMUNICATIONS
    Type: NASA. ELECTRON. RES. CENTER FUTURE FIELDS OF CONTROL APPL. AUG. 1969; P 15-22
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  • 16
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    Possible areas of control theory in print communication (1969)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Control theory application in news magazine publishing
    Keywords: COMMUNICATIONS
    Type: NASA. ELECTRON. RES. CENTER FUTURE FIELDS OF CONTROL APPL. AUG. 1969; P 3-13
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  • 17
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    Radar and data processing (1969)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Radar and data processing techniques for designing space radars for earth resources applications
    Keywords: COMMUNICATIONS
    Type: NASA. MANNED SPACECRAFT CENTER 2D ANN. EARTH RESOURCES AIRCRAFT PROGRAM STATUS REV., VOL. 2 1969 (SEE N71-11976 02-13)
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  • 18
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    Whistler propagation in a bounded magnetoplasma (1969)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Whistlers paradoxical behavior in bounded magnetoplasmas, discussing double reflection and wave propagation
    Keywords: COMMUNICATIONS
    Type: ; ADEMIE DES SCIENCES
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  • 19
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    An analysis of errors resulting from on-board recording of PCM/FM telemetry data for the Apollo telescope mount /ATM/. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Bit-slippage errors due to onboard tape recording of PCM/FM telemetry data for Apollo Telescope Mount, noting roles of S/N ratio, data characteristics, etc
    Keywords: COMMUNICATIONS
    Type: ; TROPHYSICAL JOURNAL
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  • 20
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    Comparisons between topside and ground-based soundings. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Electron density profiles from topside ionograms compared to ground based sounding results, discussing error corrections
    Keywords: COMMUNICATIONS
    Type: ; ADEMIE DES SCIENCES
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  • 21
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    A 10.6-mu optical heterodyne communication system. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Optical heterodyne communication system with single mode and frequency carbon dioxide laser, noting coherent photon noise limit
    Keywords: COMMUNICATIONS
    Type: ; 125-127.(
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  • 22
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    Synthesis techniques for a class of SSB-AM-PM signals. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Subcarrier phase modulated single sideband sinusoidal carrier synthesis, discussing signal power ratios, signal efficiency, design sensitivity, etc
    Keywords: COMMUNICATIONS
    Type: ; ACE(
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  • 23
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    The application of the image orthicon television system to rocket trajectory determination. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Rocket trajectory determination by tracking onboard light source against star background with image orthicon TV system
    Keywords: COMMUNICATIONS
    Type: ; ADEMIE DES SCIENCES
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  • 24
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    Communications for space research. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Tracking and data acquisition networks and communications systems for support of space missions, studying data processing, unified S Band System and Data Relay Satellite System
    Keywords: COMMUNICATIONS
    Type: ; 39 (
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  • 25
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    Considerations in the use of AGC in AM/FM telemetry systems. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Channel output SNR optimization in AM/FM telemetry system by using automatic gain control, discussing AGC time response and general characteristics
    Keywords: COMMUNICATIONS
    Type: ; ADEMIE DES SCIENCES
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  • 26
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    Mixing inhomogeneous, partially coherent optical fields (1969)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Signal to noise ratio for optical heterodyne with inhomogeneous partially coherent signal and local oscillator fields, using phase-quadrature description
    Keywords: COMMUNICATIONS
    Type: ; 327 (
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  • 27
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    Seismic vehicle detection (1969)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Passing surface vehicle identification using seismic signal analysis and weight estimation
    Keywords: COMMUNICATIONS
    Type: COORDINATED SCI. LAB. 1 AUG. 1969; P 337-345
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  • 28
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    A satellite observation of the relativistic Doppler shift. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Relativistic Doppler shift effect observed from radio signal periodic variation of GEOS-1 satellite
    Keywords: COMMUNICATIONS
    Type: ; YAL SOCIETY (
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  • 29
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    Frequency shifts observed in the Alouette I cyclotron harmonic plasma resonances. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Frequency shifts observed in Alouette 2 cyclotron harmonic plasma resonances, noting antenna length and direction
    Keywords: COMMUNICATIONS
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  • 30
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    M-ary Poisson detection and optical communications. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: M-ary detection for optical communication investigated for maximum likelihood detection of one of M Poisson processes in background noise
    Keywords: COMMUNICATIONS
    Type: ; STITUTION OF ENGINEE
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  • 31
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    Flight and laboratory tests of an ''L-band'' telemetry RF system. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Laboratory and flight tests of airborne solid state UHF telemetry transmitter, discussing miniaturized coaxial hardware from RF power conservation viewpoint
    Keywords: COMMUNICATIONS
    Type: ; ADEMIE DES SCIENCES
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  • 32
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    Tracking and data acquisition for space exploration. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Tracking and data acquisition systems for spacecraft and ground link through command, telemetry and tracking, noting data relay satellites, etc
    Keywords: COMMUNICATIONS
    Type: ; 125-127.(
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  • 33
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    The epsilon-capacity of classes of unknown channels. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Unknown channels classes epsilon capacity applied to estimating capacity of channels with additive noise, discussing models and upper and lower bounds
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  • 34
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    Probing the clear atmosphere with high power, high resolution radars. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Radar echoes observed from clear atmosphere, discussing scattering mechanisms of thin stable inversions, convective thermals, Benard convection cells, breaking gravity waves, etc
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    Type: ; ACE(
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  • 35
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    Radar studies of the earth. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Earth radar studies, relating echo behavior to rocket altitude and surface electrical characteristics
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    Type: ; ACE(
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  • 36
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    A new approach to estimation of initial conditions and smoothing problems. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Kalman-Bucy filtering technique for estimation of initial conditions and smoothing in linear dynamic systems, noting rectilinear motion of randomly accelerated spacecraft
    Keywords: COMMUNICATIONS
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  • 37
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    Optical communication through random atmospheric turbulence. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Optical communication through random atmospheric turbulence via heterodyne and video detection, estimating performance from optical wave propagation analysis
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  • 38
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    Rigorous field expressions for piecewise- sinusoidal line sources. (1969)
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    Publication Date: 2011-08-12
    Description: Electric field vertical and radial components for time harmonic electric line sources with piecewise sinusoidal current distribution
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  • 39
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    Conductive EMI - Responsibility and control. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Electromagnetic interference /EMI/ created by noise coupling through conductive paths, discussing responsibility for control within systems management
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  • 40
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    The design of a pulse-position modulated optical communication system (1969)
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    Publication Date: 2011-08-16
    Description: Narrow width pulse-position modulated optical communication system design, determining performance in terms of error probability and information rates
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  • 41
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    Microwave scattering by a plasma covered sphere (1969)
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    Publication Date: 2011-08-16
    Description: Forward angle microwave scattering by plasma covered magnetized metallic sphere, calculating radial electron density distribution
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  • 42
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    Comments on optical heterodyne detection (1969)
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    Publication Date: 2011-08-16
    Description: Optical heterodyne quantum detector response, calculating signal to noise ratios
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  • 43
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    The 'Apollo' communications network (1969)
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    Publication Date: 2011-08-16
    Description: Worldwide Apollo data transmission network emphasizing computer operations for message collection and distribution, command and telemetry processing, etc
    Keywords: COMMUNICATIONS
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  • 44
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    Distortion of a narrow-band FM signal in a lossless abrupt-junction nonoverdriven varactor doubler (1969)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Narrow bandwidth FM signal distortion during multiplication in lossless varactor multiplier calculated, using equivalent circuit of frequency doubler
    Keywords: COMMUNICATIONS
    Type: ; 79, 82, 83 (
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  • 45
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    Optical communication system performance with tracking error induced signal fading. (1973)
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    Publication Date: 2011-08-16
    Description: System performance is determined for an optical communication system using noncoherent detection in the presence of tracking error induced signal fading assuming (1) binary on-off modulation (OOK) with both fixed and adaptive threshold receivers, and (2) binary polarization modulation (BPM). BPM is shown to maintain its inherent 2- to 3-dB advantage over OOK when adaptive thresholding is used, and to have a substantially greater advantage when the OOK system is restricted to a fixed decision threshold.
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    Type: IEEE Transactions on Communications; COM-21; Sept
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    136-MHz/400-MHz radio-sky maps. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A radio-sky map, covering the whole celestial sphere, is helpful for determining the system noise temperature of an earth-based satellite receiving system. Detailed sky maps for the 136- and 400-MHz space research (space-to-earth) satellite frequency bands have been generated, using a computer, by the National Aeronautics and Space Administration (NASA).
    Keywords: COMMUNICATIONS
    Type: IEEE; vol. 61
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  • 47
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    Preemphasis for an S-band constant bandwidth FM/FM system. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Preemphasis schedules are given for 11 constant-bandwidth FM subcarriers modulating an S-band transmitter at various receiver SNRs (9 dB, 15 dB and 25 dB). The criterion for establishing these preemphasis curves is the achievement, at various receiver IF SNR, of equal receiver output SNR for all channels. The empirically derived results are compared with a simplified, analytically derived schedule and the primary differences are explained. The S-band preemphasis schedule is also found to differ from the lower frequency VHF case.
    Keywords: COMMUNICATIONS
    Type: Telemetry Journal; 8; Dec
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  • 48
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    Telecommunication systems engineering (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Telecommunication network concepts are discussed together with carrier-tracking loops employing the phase-lock principle, phase and Doppler measurements in two-way phase-coherent tracking systems, range measurements by phase-coherent techniques, and questions of phase-coherent detection with perfect reference signals and with noisy reference signals. The design of one-way and two-way phase-coherent communication systems is considered, giving attention to the optimal design of single-channel systems, the design of two-channel systems, and the design of multichannel systems. Other topics explored include the design and the performance of phase-coherent systems preceded by band-pass limiters, symbol synchronization and its effects on data detection, noncoherent communication over the Gaussian channel, and tracking loops with improved performance.
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  • 49
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    Compression of weather charts by the segmented Lynch-Davisson code. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The Lynch-Davisson (L-D) code is shown to be efficient for compressing line-scanned weather charts wherein each line is divided into equal-length segments, and a separate L-D code is generated for each segment. As the number of segments increases, the L-D code length decreases appreciably, thereby simplifying the encoding and decoding operations. However, the accompanying decrease in the overall compression ratio is relatively small.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Communications; COM-21; June 197
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  • 50
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    Intelligibility improvement of analog communication systems using an amplitude control technique. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: An amplitude control technique has been employed for use with analog voice communication systems, which improves low-level phoneme reception and eliminates the received noise between words and syllables. Tests were conducted on a narrow-band frequency-modulation simplex voice communication channel employing the amplitude control technique. Presented for both the modified rhyme word tests and the phonetically balanced word tests are a series of graphical plots of the tests' score distribution, mean, and standard deviation as a function of received carrier-to-noise power density ratio. At low received carrier-to-noise power density ratios, a significant improvement in the intelligibility was obtained. A voice intelligibility improvement of more than 2 dB was obtained for the modified rhyme test words, and a voice intelligibility improvement in excess of 4 dB was obtained for the phonetically balanced word tests.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Communications; COM-21; May 1973
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  • 51
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    Tracking the Apollo Lunar Rover with interferometry techniques. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Apollo 16 and 17 Lunar Rover position history while transporting astronauts over the lunar surface has been determined to a resolution of better than 1 m and uncertainties of less than 25 m utilizing a specialized very-long baseline interferometry (VLBI) tracking technique. This paper describes the technique, discusses the National Aeronautics and Space Administration worldwide tracking system used to obtain data, discusses the data, and presents results.
    Keywords: COMMUNICATIONS
    Type: IEEE; vol. 61
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  • 52
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    Multipath modeling for aeronautical communications. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: One of the fundamental technical problems in aeronautical digital communications is that of multipath propagation between aircraft and ground terminal. This paper examines in detail a model of the received multipath signal that is useful for application of modern detection and estimation theories. The model treats arbitrary modulation and covers the selective and nonselective cases. The necessarily nonstationary statistics of the received signal are determined from the link geometry and the surface roughness parameters via a Kirchhoff solution.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Communications; COM-21; May 1973
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  • 53
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    The definition of cross polarization. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Consideration of three alternate definitions of cross-polarization known to the author. The three definitions are expressed precisely in terms of the same antenna pattern coordinate system, and the relative merits of the various definitions are discussed. One of the definitions is shown to be the proper choice for describing source current polarizations, another is suitable for relating source current distributions to secondary patterns, and the third is the best choice for describing antenna patterns.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Antennas and Propagation; AP-21; Jan. 197
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  • 54
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    On the Feasibility of Efficient Multiamplitude Communication (1973)
    In:  CASI
    Details
    Publication Date: 2016-03-01
    Description: Bandwidth constraints in earth-satellite communication systems force consideration of uncoded M-ary modulation to obtain increased data rates. M-ary phase shift keying (MPSK) at first glance seems most promising because of the high transmitter efficiency achieved through Class C operation. Multiple phase-and-amplitude modulation candidates such as quadrature amplitude shift keying (QASK) appear less promising because the transmitter must operate at lower efficiency (in linear or multimode operation). However, initial studies indicate that QASK offers significant raw dc-power savings over MPSK, despite the reduced transmitter efficiency. For example, at S-band both solid-state and traveling wave tube (TWT) QASK transmitters can provide a 3-dB average dc-power savings over comparable 16-ary phase shift keying (PSK) for the same bit rate and error probability. The reason for this savings is that QASK requires much less average signal-to-noise ratio than 16-ary PSK for the same error rate.
    Keywords: COMMUNICATIONS
    Type: JPL Quart. Tech. Rev.; Vol. 2; No. 4; p 62-71
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  • 55
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    A note on signal enhancement for dual magnetometer systems. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Demonstration of the value of cross-correlation signal enhancement achieved by means of a dual magnetometer system. A unique feature of a dual magnetometer system is, as pointed out by Ness et al. (1971), the opportunity it allows for signal enhancement by using cross-correlation techniques developed in statistical communication theory. Their use is shown to make it possible to overcome the limitations that the intrinsic sensor ambient noise and the measurement-contaminating spacecraft field fluctuations impose upon the signal detection performance of a single magnetometer.
    Keywords: COMMUNICATIONS
    Type: Journal of Geophysical Research; 78; Apr. 1
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  • 56
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    Observations of noise bands associated with the upper hybrid resonance by the Imp 6 radio astronomy experiment. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The intense noise bands occurring near the upper hybrid resonance frequency have been observed with the Imp 6 GSFC radio astronomy experiment in the plasmasphere. The identification of the upper hybrid resonance provides an accurate measure of the local electron density and allows the observed noise data to be fit to the scale of characteristic frequencies in the plasma. The data are consistent with earlier theoretical interpretations in which noise is generated between the upper hybrid and plasma frequencies and propagates to region 4 of the CMA diagram, where it is reflected at the L = 0 plasma cutoff.
    Keywords: COMMUNICATIONS
    Type: Journal of Geophysical Research; 78; Apr. 1
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  • 57
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    Video-signal improvement using comb filtering techniques. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Significant improvement in the signal-to-noise performance of television signals has been obtained through the application of comb filtering techniques. This improvement is achieved by removing the inherent redundancy in the television signal through linear prediction and by utilizing the unique noise-rejection characteristics of the receiver comb filter. Theoretical and experimental results describe the signal-to-noise ratio and picture-quality improvement obtained through the use of baseband comb filters and the implementation of a comb network as the loop filter in a phase-lock-loop demodulator. Attention is given to the fact that noise becomes correlated when processed by the receiver comb filter.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Communications; COM-21; Apr. 197
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  • 58
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    A theoretical and experimental study of non-ducted VLF waves after propagation through the magnetosphere. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The nonducted propagation of artificial VLF waves through the magnetosphere has been studied by means of data obtained by the FR-1 satellite experiment, in which fixed frequency (16.8 kHz) waves radiated by a transmitter at the ground (at L equals 2.1) are received by the satellite, at 750 km altitude, both in the zone close to the transmitter and in the conjugate zone. From the wave-normal directions and Doppler shifts measured in the conjugate zone, it has been possible to identify waves that have been propagated from the Northern to the Southern Hemisphere in both ducted and nonducted modes. In this paper, the main features of the nonducted wave have been interpreted by ray tracing in models of the magnetosphere. The results improve our understanding as to why very few whistlers are observed on the ground at low latitudes.
    Keywords: COMMUNICATIONS
    Type: Journal of Atmospheric and Terrestrial Physics; 35; Jan. 197
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  • 59
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    A note on the effects of the ionosphere on satellite orbital corrections in near-real time. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Ionospheric irregularities effect on accurate satellite position determination in near real time
    Keywords: COMMUNICATIONS
    Type: ; STITUTION OF ENGINEE
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  • 60
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    Equatorial plane pattern of an axial-TEM slot on a finite size ground plane. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Edge diffraction effects in TEM axially slotted finite ground plane on radiation pattern in waveguides of different geometries
    Keywords: COMMUNICATIONS
    Type: ; SEARCH(
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  • 61
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    Block coding for space communications. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Block coded telemetry systems design for phase coherent space communication employing double conversion superheterodyne phase locked receivers
    Keywords: COMMUNICATIONS
    Type: ; STITUTION OF ENGINEE
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  • 62
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    Enhancement of photon-bunching effects. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Photon bunching effect in spatially coherent noise field enhanced by superposing monochromatic coherent signal and/or shaping incident noise spectra
    Keywords: COMMUNICATIONS
    Type: ; ADEMIE DES SCIENCES
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  • 63
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    Analysis of cross-polarized components of radar reflection data. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Graphical method for plotting contours of Rice distribution function as rocket-borne radar reflection data, determining leakage factor
    Keywords: COMMUNICATIONS
    Type: ; ACE(
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  • 64
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    Analysis of aperture radiation from an axially slotted circular conducting cylinder using geometrical theory of diffraction. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Radiation pattern of axial slot on circular conducting cylinder based on wedge diffraction and creeping wave theory
    Keywords: COMMUNICATIONS
    Type: ; YAL SOCIETY (
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  • 65
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    Power requirements for deep-space telecommunication links. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Power requirements for tracking, telecommand and telemetry of spacecraft over interplanetary distances, considering transmission problems, equipment weight and reliability
    Keywords: COMMUNICATIONS
    Type: ; 565 (
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  • 66
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    A probabilistic approach to solving assignment problems (1969)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Assignment problem for finite set elements pairing, discussing probabilistic formulations and applications to satellite communications problems
    Keywords: COMMUNICATIONS
    Type: ; ADEMIE DES SCIENCES
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  • 67
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    Attenuation and phase dispersion in the atmosphere due to the microwave spectrum of oxygen (1973)
    In:  CASI
    Details
    Publication Date: 2012-05-23
    Description: Radio wave propagation in the 40- to 140-GHz band through the earth's atmosphere is strongly influenced by the behavior of the O2 microwave spectrum. This behavior causes the transfer function to depend critically upon altitude. The spectroscopic properties of O2 are discussed and reduced to engineering formulas expressing attenuation and phase dispersion rates in terms of frequency and meteorological parameters. The theory is supported on several accounts by reliable spectroscopic measurements. Pressure scanning spectroscopy is used to investigate the O2 microwave spectrum under simulated atmospheric conditions. The application of spectroscopic information to analytical treatments of transfer properties for inhomogeneous slant paths is demonstrated. Attenuation and phase dispersion between 49 and 72 GHz are evaluated for zenith and tangential paths.
    Keywords: COMMUNICATIONS
    Type: AGARD Telecommun. Aspects on Freq. Between 10 and 100 GHz; 18 p
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  • 68
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    Requirements for tracking radar for falling spheres (1969)
    In:  CASI
    Details
    Publication Date: 2013-06-04
    Description: Error analysis on radar tracking of falling spheres
    Keywords: COMMUNICATIONS
    Type: NASA, WASHINGTON STATUS OF PASSIVE INFLATABLE FALLING-SPHERE TECHNOL. FOR ATMOSPHERIC SENSING TO 100 KM 1969; P 175-185
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  • 69
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    Voice intelligibility in satellite mobile communications (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: An amplitude control technique is reported that equalizes low level phonemes in a satellite narrow band FM voice communication system over channels having low carrier to noise ratios. This method presents at the transmitter equal amplitude phonemes so that the low level phonemes, when they are transmitted over the noisey channel, are above the noise and contribute to output intelligibility. The amplitude control technique provides also for squelching of noise when speech is not being transmitted.
    Keywords: COMMUNICATIONS
    Type: Significant Accomplishments in Technol., 1972; p 195-198
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  • 70
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    ATS-5 millimeter wave propagation measurements (1973)
    In:  CASI
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    Publication Date: 2016-06-07
    Description: Long term experimental measurements to determine the propagation characteristics of 15 and 32 GHz earth-space links and to evaluate performance characteristics of operational millimeter wave systems are reported. The ATS 5 millimeter wave experimental link experienced attenuation and fading characteristics as a function of rainfall rate and other meteorological parameters. A method of site selection for the lowest attenuation rainfall rate improved reception tremendously.
    Keywords: COMMUNICATIONS
    Type: Significant Accomplishments in Technol., 1972; p 171-174
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  • 71
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    Coordination procedure for radio relay and communication satellite services (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A global rain rate statistic model is used to link microwave propagation statistics to measurable rain statistics in order to develop international telecommunication site criteria for radio relay and communication satellite services that minimize interference between receivers and transmitters. This rain coordination procedure utilizes a rain storm cell size, a statistical description of the rainfall rate within the cell valid for most of the earth's surface, approximations between Raleigh scatter and constancy of precipitation with altitude, and an analytic relation between radar reflectivity and rain rate.
    Keywords: COMMUNICATIONS
    Type: Significant Accomplishments in Technol., 1972; p 175-178
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  • 72
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    High efficiency ground data transmission (1973)
    In:  CASI
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    Publication Date: 2016-06-07
    Description: It is demonstrated that state-of-the-art communications technology can be implemented and reliably operated on a global basis to increase the transmission rates and efficiencies on circuits with bandwidths greater than the typical speech channel. Optimization is affected by optimum clock recovery procedures, multilevel pulse amplitude modulation, single sideband amplitude modulation, transversal filter equalizers, data scrambling, and active compensation for phase instability.
    Keywords: COMMUNICATIONS
    Type: Significant Accomplishments in Technol., 1972; p 113-115
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  • 73
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    Theoretical interpretations of scatter propagation (1969)
    In:  CASI
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    Publication Date: 2016-06-07
    Description: The general features of a theory for signal scattering by turbulent irregularities are reviewed. Electromagnetic and path geometrical characteristics of the propagation are shown mathematically. The basic signal statistical distribution of the received field is also considered. The relationship of signal amplitude and phase to one another at succeeding instants of time provides a useful measure of signal fine structure.
    Keywords: COMMUNICATIONS
    Type: NAS-NRC Atmospheric Exploration by Remote Probes, Vol. 2; p 359-365
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  • 74
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    A review of transhorizon propagation as a possible tool for remote probing of the atmosphere (1969)
    In:  CASI
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    Publication Date: 2016-06-07
    Description: It is concluded that the state or structure of the atmosphere cannot be inferred unambiguously from measurement techniques used in experiments. Extensions or combinations of available techniques appear promising for use in the remote probing of the atmosphere.
    Keywords: COMMUNICATIONS
    Type: NAS-NRC Atmospheric Exploration by Remote Probes, Vol. 2; p 295-336
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  • 75
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    Comments on high power high resolution radars (1969)
    In:  CASI
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    Publication Date: 2016-06-07
    Description: Comments concerning high resolution radar are presented. Discussions on angels and Doppler radar are included.
    Keywords: COMMUNICATIONS
    Type: NAS-NRC Atmospheric Exploration by Remote Probes, Vol. 2; p 291-293
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  • 76
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    Comments on Doppler radar applications (1969)
    In:  CASI
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    Publication Date: 2016-06-07
    Description: The application of Doppler methods to theoretical or meteorological problems is discussed. Research for using radar to study and monitor severe thunderstorms, turbulence, and tornadoes is recommended.
    Keywords: COMMUNICATIONS
    Type: NAS-NRC Atmospheric Exploration by Remote Probes, Vol. 2; p 287-289
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  • 77
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    A zero-error operational video data compression system (1973)
    In:  CASI
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    Publication Date: 2016-06-07
    Description: A data compression system has been operating since February 1972, using ATS spin-scan cloud cover data. With the launch of ITOS 3 in October 1972, this data compression system has become the only source of near-realtime very high resolution radiometer image data at the data processing facility. The VHRR image data are compressed and transmitted over a 50 kilobit per second wideband ground link. The goal of the data compression experiment was to send data quantized to six bits at twice the rate possible when no compression is used, while maintaining zero error between the transmitted and reconstructed data. All objectives of the data compression experiment were met, and thus a capability of doubling the data throughput of the system has been achieved.
    Keywords: COMMUNICATIONS
    Type: Significant Accomplishments in Technol., 1972; p 199-204
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  • 78
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    Health/education telecommunications experiment (1973)
    In:  CASI
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    Publication Date: 2016-06-07
    Description: The use of ATS 6 spacecraft in a general telecommunication link for the health/education experiment demonstrates the feasibility of the small receiver-only terminal consisting of a ten foot diameter antenna located on a three-legged mount. The terminal is capable of 0 to 70 degrees elevation, course adjustment, and a plus or minus 5 degree elevation vernier adjustment. Its tuned radio frequency receiver utilizes a cavity back dipole feed and a preamplifier. The indoor unit provides further RF gain and drives a wideband limiter-discriminator.
    Keywords: COMMUNICATIONS
    Type: Significant Accomplishments in Technol., 1972; p 204-207
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  • 79
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    Adaptive ground implemented phase array (1973)
    In:  CASI
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    Publication Date: 2016-06-07
    Description: The simulation of an adaptive ground implemented phased array of five antenna elements is reported for a very high frequency system design that is tolerant to the radio frequency interference environment encountered by a tracking data relay satellite. Signals originating from satellites are received by the VHF ring array and both horizontal and vertical polarizations from each of the five elements are multiplexed and transmitted down to ground station. A panel on the transmitting end of the simulation chamber contains up to 10 S-band RFI sources along with the desired signal to simulate the dynamic relationship between user and TDRS. The 10 input channels are summed, and desired and interference signals are separated and corrected until the resultant sum signal-to-interference ratio is maximized. Testing performed with this simulation equipment demonstrates good correlation between predicted and actual results.
    Keywords: COMMUNICATIONS
    Type: Significant Accomplishments in Technol., 1972; p 103-108
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  • 80
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    ERTS wideband tape recorder (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The ERTS video bandwith tape recorder uses a rotary head to run the tape in transverse mode; the head wheel gives a head-to-tape surface speed of nearly 5080 centimeter per second. The electronics unit handles 15 megabit per second rate with a bit-error rate of 0.00001. An operational unit onboard ERTS A returned images from the 85 to 90 percent of the earth that are not available in real time.
    Keywords: COMMUNICATIONS
    Type: Significant Accomplishments in Technol., 1972; p 67-70
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  • 81
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    Coding schemes for run-length information based on Poisson distribution. (1969)
    In:  Other Sources
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    Publication Date: 2018-12-01
    Description: Huffman minimum redundancy coding extension to run-length information based on Poisson distribution, including optimization and data compression applications
    Keywords: COMMUNICATIONS
    Type: IN- NTC 69, INST. OF ELECTRICAL AND ELECTRONICS ENGINEERS, NATIONAL TELEMETERING CONFERENCE, WASHINGTON, D.C., APR. 22-24, 1969, RECORD.; P. 157-161.
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  • 82
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    Laser Communication Systems. (1969)
    In:  Other Sources
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    Publication Date: 2018-12-01
    Description: Book on laser communication system design covering modulation and detection methods
    Keywords: COMMUNICATIONS
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  • 83
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    Operations and facilities - DSN operations (1969)
    In:  CASI
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    Publication Date: 2017-07-01
    Description: Deep Space Stations configured as phase sensitive interferometer to measure apparent change in angular separation between radio sources near time of occultation by sun
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-60, VOL. 2 30 NOV. 1969; P 170-173
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  • 84
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    Advanced engineering - Communications elements research (1969)
    In:  CASI
    Details
    Publication Date: 2017-07-01
    Description: Improved RF calibration techniques for Deep Space Network
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-60, VOL. 2 30 NOV. 1969; P 37-45
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  • 85
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    Advanced engineering - Supporting research and technology (1969)
    In:  CASI
    Details
    Publication Date: 2017-07-01
    Description: Telemetry simulations, radar equipment and experiments, and related supporting research for Deep Space Network
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-60, VOL. 2 30 NOV. 1969; P 46-74
    Format: application/pdf
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  • 86
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    Introduction - Description of the DSN (1969)
    In:  CASI
    Details
    Publication Date: 2017-07-01
    Description: Deep Space Network communications, tracking, and ground support facilities and activities
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-60, VOL. 2 30 NOV. 1969; P 1-3
    Format: application/pdf
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  • 87
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    Mission support - Planetary flight projects (1969)
    In:  CASI
    Details
    Publication Date: 2017-07-01
    Description: Mariner Mars 1971 mission support and data processing modifications
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-60, VOL. 2 30 NOV. 1969; P 4-6
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  • 88
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    Development and implementation - DSN projects and systems development (1969)
    In:  CASI
    Details
    Publication Date: 2017-07-01
    Description: Multiple-mission telemetry system operations with Mariner Mars 69 and Pioneers, and clock synchronization equipment
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-60, VOL. 2 30 NOV. 1969; P 151-169
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  • 89
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    Advanced engineering - Tracking and navigational accuracy analysis (1969)
    In:  CASI
    Details
    Publication Date: 2017-07-01
    Description: Deep Space Network tracking and navigational accuracy analyses, lunar gravimetry, terrestrial gravitational constant, and orbit calculations for planetary orbiter
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-60, VOL. 2 30 NOV. 1969; P 74-136
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  • 90
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    Operations and facilities - DSIF operations (1969)
    In:  CASI
    Details
    Publication Date: 2017-07-01
    Description: RF spectrum analysis technique for DSIF telecommunications compatibility testing
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-60, VOL. 2 30 NOV. 1969; P 173-175
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  • 91
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    Development and Implementation - DSIF Development (1969)
    In:  CASI
    Details
    Publication Date: 2017-07-01
    Description: Antenna system instrumentation, phase modulator designs, control systems for transmitter and motor generator, and related DSIF developments
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-60, VOL. 2 30 NOV. 1969; P 137-151
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  • 92
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    Advanced engineering - Communications systems research (1969)
    In:  CASI
    Details
    Publication Date: 2017-07-01
    Description: Communications systems research on information systems and on digital telemetry and command in Deep Space Network
    Keywords: COMMUNICATIONS
    Type: SPACE PROGRAMS SUM. NO. 37-60, VOL. 2 30 NOV. 1969; P 7-37
    Format: application/pdf
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  • 93
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    Telecommunications Division (1969)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Coding models, antenna designs, and optimization of spacecraft communications systems
    Keywords: COMMUNICATIONS
    Type: SUPPORTING RES. AND ADVANCED DEVELOP. 30 APR. 1969; P 78-118
    Format: text
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  • 94
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    Space Sciences Division (1969)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Space instruments and physical problems in planetary observations
    Keywords: COMMUNICATIONS
    Type: SUPPORTING RES. AND ADVANCED DEVELOP. 30 APR. 1969; P 42-66
    Format: text
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  • 95
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    Nonlinear analysis of phased-locked loops with rapidly varying phase (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The performance of command and telemetry systems, useful in deep-space communications, is frequently affected by the radio-frequency phase error which is introduced at the point of reception by means of the carrier tracking loop. In low data rate communications, this phase error may vary rapidly over the duration of the signaling interval. In this paper such phase variation is characterized by a sinusoidal input phase, K sin (omega sub o t+, pi/6), which models a typical phase variation in communication over turbulent media. Conditions for synchronization stability and the acquisition behavior are examined by detailed computer study of the phase-plane trajectories for the second and third-order loops with perfect integrator. It is demonstrated that for the phase variation considered the third-order loop has no real advantage over the second-order loop. Finally, it is shown that nonzero initial conditions may result in large steady-state phase error.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-132889 , EE-209(73)
    Format: application/pdf
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  • 96
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    A one way Doppler tracking system for satellite to satellite tracking (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An S-band tracking system employing one way Doppler applicable to the tracking and data relay system (TDRS) was evaluated. This evaluation is limited to the measurement system parameters. The analysis assumes state-of-the-art components such as spacecraft oscillator long term stability of one part in 10 to the 8th power and ground station oscillator stability of one part in 10 to the 11th power. Signal characteristics comparable with the present ranging systems are utilized in the analysis. Predicated upon measurement system parameters, position uncertainties for the low orbiting spacecraft vary from 5 meters to 2 kilometers along track, 4 meters to 1 kilometer cross track, and 1 meter to 180 meters radially depending upon the tracking geometry and the high satellite position and velocity error assumptions.
    Keywords: COMMUNICATIONS
    Type: NASA-TM-X-70526 , X-591-73-307
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  • 97
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    Virginia precipitation scatter experiment: Data analysis (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Rain scatter and surface rain rate data were obtained from October 3, 1970 to October 2, 1971 using a bistatic radar system and tipping bucket rain gauges located in southeastern Virginia. The data showed that interference may occur between earth and terrestrial stations located within 80 km of each other either by mainlobe-to-mainlobe coupling or sidelobe-to-mainlobe coupling. The data further show that the distributions of scattering cross section per unit volume measured at several heights and estimated from surface rain gauge data were different. The density functions for the scattering cross section per unit volume values measured at a 3 km height and estimated from surface rain rate data were identical only for summer thundershowers. The data showed that the CCIR model used to estimate interference due to rain is inadequate because the cell size and change of scattering cross section per unit volume with height estimates of the model predict transmission loss values that are too low (more interference than will occur).
    Keywords: COMMUNICATIONS
    Type: NASA-TM-X-70457 , X-750-73-55-REV
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  • 98
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    Estimation and detection of signals in multiplicative noise (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A class of detection-estimation problems on matrix Lie groups is defined in which the observation noise is multiplicative in nature. By examining the differential versions of the hypotheses, which are bilinear in nature, it is possible to derive the relevant likelihood ratio formula and the associated optimal estimation equations for the signal given the observations and the assumption that the signal is present. These estimation equations are of interest in their own right, in that they represent a finite dimensional optimal solution to a nonlinear estimation problem and can be viewed as consisting of a Kalman-Bucy filter along with the on-line computation of the solution of the associated Riccati equation, which is driven by the observations. The usefulness of these results is illustrated via an example concerning the detection of an actuator failure in a rigid body rotational control system.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-136301 , ESL-P-521
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  • 99
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    An experimental study of the temporal statistics of radio signals scattered by rain (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A fixed-beam bistatic CW experiment designed to measure the temporal statistics of the volume reflectivity produced by hydrometeors at several selected altitudes, scattering angles, and at two frequencies (3.6 and 7.8 GHz) is described. Surface rain gauge data, local meteorological data, surveillance S-band radar, and great-circle path propagation measurements were also made to describe the general weather and propagation conditions and to distinguish precipitation scatter signals from those caused by ducting and other nonhydrometeor scatter mechanisms. The data analysis procedures were designed to provide an assessment of a one-year sample of data with a time resolution of one minute. The cumulative distributions of the bistatic signals for all of the rainy minutes during this period are presented for the several path geometries.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-136275 , OT-15
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  • 100
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    Measurements of VLF polarization and wave normal direction on OGO-F (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A major achievement of the F-24 experiment on OGO 6 was a verification of the theory of the polarization of proton whistlers. As predicted, the electron whistler was found to be right-hand polarized and the proton whistler left hand polarized. The transition from right- to left-hand polarization was found to occur very rapidly. Thus it appears that the experimental technique may allow great accuracy in the measurement of the cross-over frequency, a frequency that provides information on the ionic composition of the ionosphere.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-132882 , NSSDC-ID-69-051A-24-PM
    Format: application/pdf
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