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    136 MHz Interferometer Error Due to Galactic Nucleus

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    Author
    Kyriakopoulos, N.
    Taylor, R. E.
    Reich, R.
    Issue Date
    1971-09
    
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    Rights
    Copyright © International Foundation for Telemetering
    Collection Information
    Proceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection.
    Publisher
    International Foundation for Telemetering
    Journal
    International Telemetering Conference Proceedings
    Abstract
    Spacecraft orbits are determined by means of direction cosines generated from electrical phase data provided by the 136 MHz Minitrack radio-interferometer system. The phase data thus determine the direction cosines of the position vector as the spacecraft passes across Minitrack's fan-shaped antenna beam. Uncertainties introduced into the output electrical phase due to undesirable interfering sources limit the basic accuracy of the Minitrack system. Although a knowledge of the spacecraft orbital dynamics may be used to improve the accuracy of the system, nevertheless there remains a fundamental error due to interference caused by the passage of the galactic nucleus. This paper determines the error due to a distributed noise source. Furthermore, it develops an expression for the lower bound of the phase error when the noise source is not uniformly distributed across a zenith-pointed fan beam. In addition, it determines the threshold of the Minitrack input power levels below which the electrical phase is no longer determined unambiguously. The effect of the passage of the galactic nucleus coincident with the presence of a space craft has been analyzed, and the corresponding phase error determined.
    Sponsors
    International Foundation for Telemetering
    ISSN
    0884-5123
    0074-9079
    Additional Links
    http://www.telemetry.org/
    Collections
    International Telemetering Conference Proceedings, Volume 07 (1971)

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