Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991tdapr.104..219s&link_type=abstract
In its The Telecommunications and Data Acquisition Report p 219-234 (SEE N91-18308 10-32)
Astronomy and Astrophysics
Astronomy
Algorithms, Approximation, Doppler Effect, Oscillators, Planet Ephemerides, Radar Astronomy, Chebyshev Approximation, Mean Square Values, Phase Error, Polynomials, Series Expansion, Signal Processing, Space Communication
Scientific paper
The 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.
Sadr R.
Shahshahani Mehrdad
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