NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Planetary ephemerides approximation for radar astronomyThe planetary ephemerides approximation for radar astronomy is discussed, and, in particular, the effect of this approximation on the performance of the programmable local oscillator (PLO) used in Goldstone Solar System Radar is presented. Four different approaches are considered and it is shown that the Gram polynomials outperform the commonly used technique based on Chebyshev polynomials. These methods are used to analyze the mean square, the phase error, and the frequency tracking error in the presence of the worst case Doppler shift that one may encounter within the solar system. It is shown that in the worst case the phase error is under one degree and the frequency tracking error less than one hertz when the frequency to the PLO is updated every millisecond.
Document ID
19910009013
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sadr, R. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Shahshahani, M. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 6, 2013
Publication Date
February 15, 1991
Publication Information
Publication: The Telecommunications and Data Acquisition Report
Subject Category
Astronomy
Accession Number
91N18326
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

IDRelationTitle19910008995Collected WorksThe Telecommunications and Data Acquisition Report
No Preview Available