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  • 1
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    A world-wide lunar radar time synchronization system (1970)
    In:  CASI
    Details
    Publication Date: 2012-05-22
    Description: Synchronizing clocks at remote locations with master clock by radar reflected from moon for Deep Space Network
    Keywords: COMMUNICATIONS
    Type: AGARD ADVANCED NAVIGATIONAL TECH. JAN. 1970; P 143-162
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Applications to ranging. (1964)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: Operational ranging systems using waves coded by sequences having multiple peaks in their autocorrelation functions
    Keywords: COMMUNICATIONS
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Modulation by pseudo-random sequences. (1964)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: Signal spectra and digital characteristics in design of binary modulation systems
    Keywords: COMMUNICATIONS
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Radio frequency arraying method for receivers (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A method and apparatus for increasing the signal to noise ratio of a receiving facility for coherent frequency reception by arraying receiving systems using separate antennas for each, or one antenna for all systems are presented. One system is operated with a carrier tracking loop to provide a first local oscillator frequency for the first and all other systems arrayed, with individual tracking loops in all other systems operated at IF for tracking out any phase differences due to separate group delays using an adjustable phase shifter for a second reference to compensate for different group delays in the antenna and low noise amplifier of each of the other systems. The second IF output of all systems is summed into the first system. This technique may also be used when two systems are arrayed to an antenna designed for circular or linear polarization diversity reception to effectively provide the same signal to noise ratio for both polarized signal transmission channels that would result from matched polarization. An arrangement adapted to high rate telemetry reception is disclosed. With additional components, the same arrangement is adapted to provide low rate telemetry reception as well.
    Keywords: COMMUNICATIONS AND RADAR
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Receiver for Antenna Arrays (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Diversity reception system combines narrow-band signals from several antennas to yield amplified demodulated signal. System was developed for spacecraft command signals, which typically have bandwidths of few hundred hertz.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-15089 , NASA Tech Briefs (ISSN 0145-319X); 7; 3; P. 257
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Two carrier communication system with single transmitter (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A pulse code modulated communication system is disclosed for transmitting two subcarrier modulated carriers from a single transmitter comprising two channels for phase modulating the two carriers independently. The modulating subcarriers are independently modulated by data and/or pseudonoise (PN) codes as desired. The modulated carriers are switched alternately to the single transmitter in synchronism with operation of a PN code generator when PN code modulation is present, as for ranging.
    Keywords: COMMUNICATIONS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Two-carrier command modulation system (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Two carriers transmit two high-power signals from single transmitter, each phase-modulated by subcarrier which, in turn, is modulated by data bits; switching between two carriers is alternated at high rate. Resulting composite signal is multiplied up to desired frequency and used to drive power amplifier which feeds transmitting antenna.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-11548
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Arrayed receivers for low-rate telemetry (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: RF carrier array includes one master and slave receiving system to improve overall signal-to-noise ratio. Greater number of slave systems creates additional improvement. Scheme reduces detection threshold of low-rate telemetry signals transmitted from spacecraft, enhancing communications efficiency.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-14590 , NASA Tech Briefs (ISSN 0145-319X); 5; 3; P. 285
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Phase-locked loop with sideband rejecting properties Patent (1966)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Phase locked loop with sideband rejecting properties in continuous wave tracking radar
    Keywords: COMMUNICATIONS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    A world-wide lunar radar time synchronization system (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Clock synchronization system using lunar radar reflections for Deep Space Network needs, discussing remote clock receiver and antenna
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: ADVANCED NAVIGATIONAL TECHNIQUES, NATO, AGARD, SYMPOSIUM, 14TH; Sep 12, 1967 - Sep 15, 1967; MILAN; ITALY
    Format: text
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    NASA TECHNICAL REPORTS
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