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  • 1
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    DSN telemetry system performance with convolutionally code data (1975)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: The results obtained to date and the plans for future experiments for the DSN telemetry system were presented. The performance of the DSN telemetry system in decoding convolutionally coded data by both sequential and maximum likelihood techniques is being determined by testing at various deep space stations. The evaluation of performance models is also an objective of this activity.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Deep Space Network p184-213 (SEE N76-15190 06-12)
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  • 2
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    An extensive bibliography on long baseline interferometry (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Long baseline interferometry has grown from a simple concept of an optical device for detecting light fringes to a highly theoretical and sophisticated system assisted by computers and modern electronic components. The areas of applications include radio astronomy, radio science, geodesy, tectonics, space navigation, and seismology.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Deep Space Network; p 154-181
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  • 3
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    DSN telemetry system performance using a maximum likelihood convolutional decoder (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Results are described of telemetry system performance testing using DSN equipment and a Maximum Likelihood Convolutional Decoder (MCD) for code rates 1/2 and 1/3, constraint length 7 and special test software. The test results confirm the superiority of the rate 1/3 over that of the rate 1/2. The overall system performance losses determined at the output of the Symbol Synchronizer Assembly are less than 0.5 db for both code rates. Comparison of the performance is also made with existing mathematical models. Error statistics of the decoded data are examined. The MCD operational threshold is found to be about 1.96 db.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Deep Space Network; p 149-161
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  • 4
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    DSN telemetry system performance with convolutionally coded data: Maximum likelihood decoding (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: DSN telemetry system performance is analyzed based on convolutionally coded data for the short constraint length 7:1/2 codes at low bit rates, 8 to 2,048 bits per second, obtained from CTA 21 for the S-band configuration. The results indicate that a loss of one or more decibels in the system performance may be expected due to system degradation. Also, burst error lengths up to 100 bits may not be unusual in actual operational situations.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Deep Space Network; p 112-122
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  • 5
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    Encoding and decoding a telecommunication standard command code (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A simple encoder/decoder implementation scheme is described for the (63,56) BCH code which can be used to correct single errors and to detect any even-number of errors. The scheme is feasible for onboard-spacecraft implementation.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Deep Space Network; p 115-119
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  • 6
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    DSN telemetry system performance with convolutionally coded data using operational maximum-likelihood convolutional decoders (1976)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The DSN telemetry system performance with convolutionally coded data using the operational maximum-likelihood convolutional decoder (MCD) being implemented in the Network is described. Data rates from 80 bps to 115.2 kbps and both S- and X-band receivers are reported. The results of both one- and two-way radio losses are included.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Deep Space Network; p 81-101
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  • 7
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    X-band antenna gain and system noise temperature of 64-meter deep space stations (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A set of measured data on the X-band performance of the three 64-meter deep space stations was obtained for use in future mission telecommunication design and predictions. The test configuration and measurement procedure is described. A method of modelling attenuation due to the atmosphere is given. Radio source brightness temperature and flux density are reviewed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Deep Space Network, Vol. 39; p 76-99
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  • 8
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    Addendum to 'A new hybrid algorithm for computing a fast discrete Fourier transform' (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The reported investigation represents a continuation of a study conducted by Reed and Truong (1979), who proposed a hybrid algorithm for computing the discrete Fourier transform (DFT). The proposed technique employs a Winograd-type algorithm in conjunction with the Mersenne prime-number theoretic transform to perform a DFT. The implementation of the technique involves a considerable number of additions. The new investigation shows an approach which can reduce the number of additions significantly. It is proposed to use Winograd's algorithm for computing the Mersenne prime-number theoretic transform in the transform portion of the hybrid algorithm.
    Keywords: MATHEMATICAL AND COMPUTER SCIENCES (GENERAL)
    Type: IEEE Transactions on Computers; C-30; June 198
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  • 9
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    Transform decoding of Reed-Solomon codes over GF(2 to the 2n power using the techniques of Winograd (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An algorithm for computing a Fourier-like transform over GF(2 to the (second power) to the n power), where n = 1,2,3,4,5, was developed to encode and decode and Reed-Solomon (RS) codes of length 2 to the (second power) to the n power. Such as RS detector is considerably faster than a decoder that uses the conventional fast transform over GF(2 to the (second power) to the n power).
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: The Deep Space Network; p 141-163
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  • 10
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    Representation of multivalued logic functions (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Systematic method for representing multivariate finite Galois field functions can simplify synthesis of multivalued logic elements.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: NPO-13760 , NASA Tech Briefs (ISSN 0145-319X); 3; 4; P. 627
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