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At least 973 records · Page 54
All sourcesNASA NTRSDOE OSTI
NASA NTRS1977

Mu-2 ranging

The Mu-II Dual-Channel Sequential Ranging System designed as a model for future Deep Space Network ranging equipment is described. A list of design objectives is followed by a theoretical explanation of the digital demodulation techniques first employed in this machine. Hardware and software implementation are discussed, together with the details relating to the construction of the device. Two appendixes are included relating to the programming and operation of this equipment to yield the maximum scientific data.

Martin, W. L.↗
NASA NTRS1977

Tracking and Data System Support for the Mariner Venus/Mercury 1973 Project

The Tracking and Data System, which provided outstanding support to the Mariner Venus/Mercury 1973 project during the period from January 1970 through March 1975 are chronologically described. In the Tracking and Data System organizations, plans, processes, and technical configurations, which were developed and employed to facilitate achievement of mission objectives, are described. In the Deep Space Network position of the tracking and data system, a number of special actions were taken to greatly increase the scientific data return and to assist the project in coping with in-flight problems. The benefits of such actions were high; however, there was also a significant increase in risk as a function of the experimental equipment and procedures required.

Davis, E. K.↗
NASA NTRS1977

DSN tracking system: Mark III-77

The Deep Space Network tracking system is described. Revisions of subsystem Mark III-75 are briefly outlined, and the currently used multimission support subsystem Mark III-77 is described. Tracking functions performed are given as well.

Chaney, W. D.↗
NASA NTRS1977

Pioneer Venus 1978 mission support

The Deep Space Network master schedule for the Pioneer Venus 1978 mission is updated. Current support status for the mission is described.

Miller, R. B.↗
NASA NTRS1977

Viking extended mission support

The period 1 March 1977 through 30 April 1977 is reported and includes Deep Space Network (DSN) Mark III data system testing. Status of the Viking DSN discrepancy reporting system as well as the status of Viking related tracking and command support were also considered. Operations support of Viking events and radio science activities were examined. Current progress on the major reconfiguration of the Network is presented in the context of support for the Viking extended mission.

Howe, T. W.↗
NASA NTRS1977

Helios mission support

Activities of the Deep Space Network in support of the Helios project from 15 April through 15 June 1977 are reported. Information concerning Helios-2's superior conjunction period, Faraday rotation experimentation during solar conjunction, updated Mark III data system status, and other mission oriented activities is included.

Goodwin, P. S.↗
NASA NTRS1977

Maintenance and operations cost model for DSN subsystems

A procedure is described which partitions the recurring costs of the Deep Space Network (DSN) over the individual DSN subsystems. The procedure results in a table showing the maintenance, operations, sustaining engineering and supportive costs for each subsystems.

Burt, R. W.↗
NASA NTRS1977

An improved digital algorithm for fast amplitude approximations of quadrature pairs

A computationally fast algorithm for approximating the amplitude (A) of a quadrature pair (I,Q) has been discovered. The piecewise linear formula, the unbiased estimate of A=X+1/8y when X or = 3Y and 7/8X + 1/2Y when X or = 3Y applies where X is congruent to the maximum absolute value of (I,Q) and Y is congruent to the minimum absolute value of (I,Q). This algorithm has been proven to be far more accurate then currently used approximations. An immediate application is the wideband digital spectrum analyzer under development for monitoring radio frequency interference at Deep Space Network stations.

Levitt, B. K.↗
NASA NTRS1977

Publications of the Jet Propulsion Laboratory 1976

The formalized technical reporting, released January through December 1975, that resulted from scientific and engineering work performed, or managed, by the Jet Propulsion Laboratory is described and indexed. The following classes of publications are included: (1) technical reports; (2) technical memorandums; (3) articles from bi-monthly Deep Space Network (DSN) progress report; (4) special publications; and (5) articles published in the open literature. The publications are indexed by: (1) author, (2) subject, and (3) publication type and number. A descriptive entry appears under the name of each author of each publication; an abstract is included with the entry for the primary (first-listed) author. Unless designated otherwise, all publications listed are unclassified.

Source record↗
NASA NTRS1977

Viking mission support

Statistics listing the Deep Space Network tracking and command support and the discrepancy report status for 1 January through 28 February 1977 are presented in tables. The initial Viking extended mission period of normal DSN support, following the nonstandard operations during the solar conjunction period is included. Operational testing subsequent to the MK III data system installations at DSS 12, 44, and 62 during this period are also discussed.

Johnston, D. W. H.↗
NASA NTRS1977

Pioneer mission support

Activities within the Deep Space Network in support of the Pioneer Project's in-flight spacecraft during the period December 1976 through March 1977 are reported. The amount of tracking coverage provided by the network and a summary of operational testing ot the Mark III Data Subsystems are presented.

Adamski, T. P.↗
NASA NTRS1977

Helios mission support

Deep Space Network coverage of Helios-1 and Helios-2 from Feb. 1 through Apr. 15, 1977 is presented in tabular form. Mark III data system (MDS) performance and station modifications for MDS configuration are discussed. Cross support for Helios operations by DSN and STDN is described and their downlink performances compared.

Goodwin, P. S.↗
NASA NTRS1977

DSN radio science system description and requirements

The data system created to collect the functions performed by the Deep Space Network in support of spacecraft radio science experiments is described. Some of the major functional requirements presently being considered for the system are delineated.

Mulhall, B. D. L.↗
NASA NTRS1977

Selectable polarization at X-band

The X-band feeds in the Deep Space Network were upgraded to include selectable polarization in time for the Voyager missions to the outer planets. The modified antenna feed has the following major items added: two circular waveguide rotary joints, drive motor and gear reducer, gear assembly, two microswitches, and a polarization control junction box. The overall length of the feed remains the same because circular waveguide spacing sections were designed into the original feed to readily permit such modifications. There is no significant increase in antenna noise temperature compared to the original feed.

Hartop, R. W.↗
NASA NTRS1977

VLBI Validation Project

Two training and three operational Deep Space Network experiments conducted in support of the very long baseline interferometry (VLBI) validation project are reported. Vector measurements using common benchmark locations at continental distances (Goldstone, Haystack, and the McDonald Observatory) with an accuracy goal on the order of 5 cm. were obtained and compared with laser ranging systems data.

Ross, W. J.↗
NASA NTRS1978

DSN ground communications facility

A functional description of the ground communications facility and its relationships with other elements of the Deep Space network and the world-wide NASA communications network (NASCOM) is presented together with development activities and goals and comments on implementation activities in support of flight projects.

Evans, R. H.↗
NASA NTRS1978

Viking extended mission support

The status of the Viking Deep Space Network Mark 3 '77 data subsystem implementation project and related testing at DSS 42/43 from 1 September through 31 October 1977 are reported. The Viking DSN discrepancy reporting system, Viking command support, tracking support, and periodic tests conducted with the Viking spacecraft are also discussed.

Howe, T. W.↗
NASA NTRS1978

Preliminary design work on a DSN VLBI correlator

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.

Lushbaugh, W. A.↗