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  • Other Sources  (61)
  • COMMUNICATIONS AND RADAR  (61)
  • Analytical Chemistry and Spectroscopy
  • Cell & Developmental Biology
  • 1980-1984  (61)
  • 1960-1964
  • 1950-1954
  • 1905-1909
  • 1983  (61)
  • 1952
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  • 1980-1984  (61)
  • 1960-1964
  • 1950-1954
  • 1905-1909
Year
  • 11
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    Satellite provided fixed communications services: A forecast of potential domestic demand through the year 2000: Volume 2: Main text (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Potential satellite-provided fixed communications services, baseline forecasts, net long haul forecasts, cost analysis, net addressable forecasts, capacity requirements, and satellite system market development are considered.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-168146 , NAS 1.26:168146
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 12
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    Microwave monolithic integrated circuit development for future spaceborne phased array antennas (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The development of fully monolithic gallium arsenide (GaAs) receive and transmit modules suitable for phased array antenna applications in the 30/20 gigahertz bands is presented. Specifications and various design approaches to achieve the design goals are described. Initial design and performance of submodules and associated active and passive components are presented. A tradeoff study summary is presented highlighting the advantages of distributed amplifier approach compared to the conventional single power source designs.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-83518 , NAS 1.15:83518 , E-1867 , Ann. Commun. Satellite System Conf.; Mar 18, 1984 - Mar 22, 1984; Orlando, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 13
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    Effects of ISI and satellite channel nonlinearity on Viterbi demodulation/decoding (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: It is shown that, for convolutionally coded transmission over bandwidth-constrained channels, a mere reversal of the switching direction at the encoder output produces a change in the system bit error probability performance. This change is significant when the Viterbi demodulator/decoder is matched to the total channel memory and is more significant for linear channels than for nonlinear ones. The reversal of switching direction is a simple demonstration of the fact that the well-known optimum codes for the linear AGWN channel are no longer necessarily optimum for a bandwidth-constrained channel with or without the addition of channel nonlinearity. It is concluded that potentially significant performance improvement can be obtained by matching the encoder (through the appropriate choice of tap weights and modulo-2 summers) to the channel in addition to matching the demodulator/decoder to the channel for a given encoder.
    Keywords: COMMUNICATIONS AND RADAR
    Format: text
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    NASA TECHNICAL REPORTS
  • 14
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    The effects of pulse rate, power, width and coding on signal detectability (1983)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The effects on the signal detectability of varying the pulse repetition rate (PRF), peak pulse power (p(pk)) and pulse width (tau(p)) (tp) are examined. Both coded and uncoded pulses are considered. The following quantities are assumed to be constant; (1) antenna area, (z)echo reflectivity, (3) Doppler shift, (4) spectral width, (5) spectral resolution, (6) effective sampling rate, and (7) total incoherent spectral averagaing time. The detectability is computed for two types of targets.
    Keywords: COMMUNICATIONS AND RADAR
    Type: International Council of Scientific Unions Middle Atmosphere Program, Vol. 9; p 100-104
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 15
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    The Urbana MST radar, capabilities and limitations (1983)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The 41-MHz coherent-scatter radar located northeast of the University of Illinois at Urbana is being used for studies of the troposphere, stratosphere and mesosphere regions. The antenna consists of 1008 halfwave dipoles with a physical aperture of 11000 sq m. Transmitted peak power is about 750 kW. Clear-air returns may be received from 6 km to 90 km altitude. Autocorrelation functions of the scattered signal are calculated on-line. From the autocorrelation functions the scattered power, line-of-sight velocity and signal correlation time are calculated. Some aspects of the troposphere/stratosphere and the mesosphere observations are discussed. Capabilities and limitations of the Urbana MST radar are pointed out, and recent and planned improvements to the radar are described.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Intern. Council Sci. Unions Middle Atmosphere Program, Vol. 9; p 346-356
    Format: application/pdf
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  • 16
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    Planetary Radar (1983)
    In:  CASI
    Details
    Publication Date: 2014-09-12
    Description: The application of modern planetary radar techniques to a comet passing in close proximity to Earth is discussed. These techniques have the potential to determine the nature of cometary origins, structure, and internal dynamics. Moreover, the understanding gained could very likely negate or corroborate one of the prevailing hypotheses regarding the origin of the solar system: that comets are the remainder of the primordial out of which the planets coalesced approximately 4.5 billion years ago. In 1983, two unique opportunities were presented to observe a comet very near to Earth. The last such encounter was several centuries ago.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Telecommun. and Data Acquisition Rept.; p 114-115
    Format: text
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  • 17
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    Atmospheric Effects (1983)
    In:  CASI
    Details
    Publication Date: 2014-09-11
    Description: The Earth's atmosphere consists mostly of the dry components oxygen (about 21% by volume), nitrogen (about 78% by volume) argon (about 1% by volume), and wet components (water vapor, clouds and rain). Water vapor at 100% relative humidity is approximately 1.7% by volume assuming the U.S. Standard Atmosphere, 15 C, at sea level. A communications link through the atmosphere suffers attenuation from both the dry and wet components. This results in a decreased signal to noise ratio (SNR) of the communications link due to both the signal attenuation and the increased noise temperature resulting from thermal emission.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Deep Space Network: A Radio Commun. Instr. for Deep Space Exploration; 18 p
    Format: text
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  • 18
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    Slotted waveguide array antennas for spaceborne SAR applications (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Starting with mission definitions and constraints for the NASA proposed Shuttle Active Microwave Experiments (SAMEX) and Free Flying Imaging Radar Experiment (FIREX), Hughes Aircraft Company has compiled and studied the technology available for slotted waveguide planar array antennas suitable for spaceborne SAR application. Antenna performance is derived, and fabrication techniques are discussed. Mission requirements will always lead to an aperture subdivided into waveguide modules, thereby validating a module definition for other mission building blocks. Finally, a specific design is proposed for a SAMEX mission using the modules as RF aperture building blocks, resulting in a (nominal) 15.1 meter by 5.5 meter extensile dual polarized L-, C-, and X-band planar array with an associated extensile graphite/epoxy support structure. Antenna development begin with a fabrication method development study involving a representative portion of an antenna module.
    Keywords: COMMUNICATIONS AND RADAR
    Type: JPL Spaceborne Imaging Radar Symp.; p 35-40
    Format: text
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    NASA TECHNICAL REPORTS
  • 19
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    Radar image interpretation techniques applied to sea ice geophysical problems (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The geophysical science problems in the sea ice area which at present concern understanding the ice budget, where ice is formed, how thick it grows and where it melts, and the processes which control the interaction of air-sea and ice at the ice margins is discussed. The science problems relate to basic questions of sea ice: how much is there, thickness, drift rate, production rate, determination of the morphology of the ice margin, storms feeling for the ice, storms and influence at the margin to alter the pack, and ocean response to a storm at the margin. Some of these questions are descriptive and some require complex modeling of interactions between the ice, the ocean, the atmosphere and the radiation fields. All involve measurements of the character of the ice pack, and SAR plays a significant role in the measurements.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Spaceborne Imaging Radar Symp.; p 116-117
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    NASA TECHNICAL REPORTS
  • 20
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    Use of coregistered radar, visible and IR images for geologic remote sensing (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The Shuttle Imaging Radar (SIR-A) obtained images over the southern portion of the San Rafael Swell in eastern Utah. SEASAT SAR and LANDSAT MSS images and thermal inertia data from the Heat Capacity Mapping Mission (HCMM) were correlated with the SIR-A data. Radar images obtained with different incidence angles and different illumination directions were compared with images obtained in other portions of the spectrum for geologic remote sensing.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Spaceborne Imaging Radar Symp.; p 13-16
    Format: text
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