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  • 1
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    Telemetry coding study for the international magnetosphere explorers mother-daughter and heliocentric missions. Volume 1: Summary (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The convolutional coding study on the IME Mother-Daughter and Heliocentric spacecraft is reported. The three major tasks involved in the study are summarized.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-132880 , ASAO-PR20046-4-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Shuttle communications design study (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The design and development of a space shuttle communication system are discussed. The subjects considered include the following: (1) Ku-band satellite relay to shuttle, (2) phased arrays, (3) PN acquisition, (4) quadriplexing of direct link ranging and telemetry, (5) communications blackout on launch and reentry, (6) acquisition after blackout on reentry, (7) wideband communications interface with the Ku-Band rendezvous radar, (8) aeroflight capabilities of the space shuttle, (9) a triple multiplexing scheme equivalent to interplex, and (10) a study of staggered quadriphase for use on the space shuttle.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-141761 , ASAO-PR20056-12
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Partial correlation properties of pseudonoise /PN/ codes in noncoherent synchronization/detection schemes (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: This concise paper considers the effect on the autocorrelation function of a pseudonoise (PN) code when the acquisition scheme only integrates coherently over part of the code and then noncoherently combines these results. The peak-to-null ratio of the effective PN autocorrelation function is shown to degrade to the square root of n, where n is the number of PN symbols over which coherent integration takes place.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Communications; COM-24; Aug. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Limiter-discriminator detection performance of Manchester and NRZ coded FSK (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The theory of limiter-discriminator detection of a frequency shift keyed (FSK) carrier is reviewed and this theory is used to predict the bit error probability performance of Manchester coded and nonreturn-to-zero (NRZ) coded data. A major result of the study is that the predetection time bandwidth product BT and the deviation ratio h needed to give optimum performance for Manchester coding are seen to be larger than optimum NRZ FSK. Specifically, BT of about 2 and h of about 1 will result in Manchester performance about 2 dB worse than optimum NRZ.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Aerospace and Electronic Systems; AES-13; Jan. 197
    Format: text
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  • 5
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    Power spectrum analysis of staggered quadriphase-shift-keyed signals (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Mathematical analysis of power spectrum of outputs from high-reliability communication system is used to determine system bandwidth. Analysis provides mathematical relationships of signal power spectrum at output of hard limiter for any type of baseband pulse input subjected only to output parameter constraints.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: MSC-14865
    Format: application/pdf
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  • 6
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    Telemetry coding study for the international magnetosphere explorers, mother/daughter and heliocentric missions. Volume 2: Final report (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A convolutional coding theory is given for the IME and the Heliocentric spacecraft. The amount of coding gain needed by the mission is determined. Recommendations are given for an encoder/decoder system to provide the gain along with an evaluation of the impact of the system on the space network in terms of costs and complexity.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-132834 , ASAO-PR20046-4-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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