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  • 1
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    Planning for VLA/DSN arrayed support to the Voyager at Neptune (1985)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Preplanning for the use of the National Radio Astronomy Observatory's Very Large Array (VLA) in support of Voyager at Neptune has been underway since early 1982. When arrayed with the Deep Space Network (DSN) antennas at Goldstone, CA, the VLA more than doubles the potential data return over the American longitude for the 1989 Voyager encounter. The background, rationale and current status of planning for VLA-DSN Arrayed Support to the Voyager at Neptune are discussed.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: The Telecommun. and Data Acquisition Progr. Rept.; p 125-135
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    NASA TECHNICAL REPORTS
  • 2
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    Preliminary design work on a DSN VLBI correlator (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: The Deep Space Network is in the process of fielding high-density digital instrumentation recorders for support of the Pioneer Venus 1978 entry experiment and other related tasks. It has long been obvious that these recorders would also serve well as the recording medium for very long base interferometry (VLBI) experiments with relatively weak radio sources, provided that a suitable correlation processor for these tape recordings could be established. The overall design and current status of a VLBI correlator designed to mate with these tape recorders are described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The Deep Space Network; p 90-98
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    NASA TECHNICAL REPORTS
  • 3
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    Convolutional coding results for the MVM '73 X-band telemetry experiment (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: Results of simulation of several short-constraint-length convolutional codes using a noisy symbol stream obtained via the turnaround ranging channels of the MVM'73 spacecraft are presented. First operational use of this coding technique is on the Voyager mission. The relative performance of these codes in this environment is as previously predicted from computer-based simulations.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Deep Space Network; p 18-21
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    NASA TECHNICAL REPORTS
  • 4
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    Data acquisition and editing for the celestial mechanics experiment (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-27
    Description: A radio tracking subsystem is reported in which the critical elements are the frequency standard and its distribution subsystem, as they ultimately limit the accuracy of both range and Doppler measurements. A rubidium vapor standard serves as the primary reference. After frequency multiplication to S-band and additional amplification, the carrier is transmitted to the spacecraft where a phase-locked receiver-transmitter system filters the signal, introduces a slight frequency shift, and retransmits it to the ground. Doppler is measured by comparing the received frequency with that being transmitted.
    Keywords: SPACE SCIENCES
    Type: Mariner Mars 1971 Proj., Vol. 4; p 407-414
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  • 5
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    A VLA experiment: Planning for Voyager at Neptune (1985)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: A very large array (VLA) engineering experiment was conducted on the night of July 22, 1983 to explore one aspect of the potential for the VLA to support Voyager at its Neptune encounter in August of 1989. Specifically, the experiment tested the abiliy of the VLA to self-calibrate on a natural radio source whose effective signal strength is the same as Voyager's will be at its Neptune encounter. The experiment was successful and supported the belief that the VLA would be able to be self-calibrated with Voyager's signal.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: The Telecommun. and Data Acquisition Progr. Rept.; p 136-142
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  • 6
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    A flexible high-speed sequential decoder for deep space channels. (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: This paper describes a sequential decoding machine built at the Jet Propulsion Laboratory (JPL), which uses a 3-bit quantization of the code symbols and achieves a computation rate of MHz. This machine is flexible and can be programmed to decode any complementary convolutional code with rates down to 1/4 and constraint lengths up to 32. In addition, metric programmability is provided for optimization of decoder performance with respect to channel parameter variations.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Communication Technology; COM-19; Oct. 197
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  • 7
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    An optimum squaring loop prefilter (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Squaring loops for establishing coherent carrier reference for bi-phase PSK modulation, deriving optimal presquaring filter
    Keywords: ELECTRONIC EQUIPMENT
    Type: ; YAL SOCIETY (
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    On improved ranging (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The use of a 1 MHz range code and a narrow-passband IF filter reduces waveform distortion error by a factor of as much as 20. Along with this improvement in ranging precision, ranging accuracy is enhanced by nullifying many errors caused by equipment vagaries. The IF filter and concomitant modification of ranging system software (and in the case of the planetary ranging assembly, hardware) are the most cost-effective way of improving the current generation ranging system.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Deep Space Network; p 40-44
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    On optimal signals for phase-locked loops (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Optimum signals for phase locked or delay locked loops determined as function of signal to noise ratio
    Keywords: ELECTRONICS
    Type: ; TROPHYSICAL JOURNAL
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  • 10
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    MODC2 procedures for assembly of MODCOMP-2 programs using the Sigma 5 assembler (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A set of programs was written to enable the METASYMBOL macro-assembler of the Sigma 5 to assemble programs for an attached MODCOMP-2 minicomputer. This program set is a follow-on to previously developed program sets which facilitated assemblies for the PDP-11 and SDS-930.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: The Deep Space Network; p 47-53
    Format: text
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