Statistics – Computation
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984tdar.nasa...96r&link_type=abstract
In its The Telecommunications and Data Acquisition Rept. p 96-106 (SEE N85-13980 05-32)
Statistics
Computation
Carrier Frequencies, Estimating, Kalman Filters, Smoothing, Tracking Filters, Covariance, Deep Space Network, Electromagnetic Noise, Loops, Phase Error, Phase Locked Systems, Voyager Project
Scientific paper
Smoothing as a way to improve the carrier phase estimation is proposed and analyzed. The performance of first and second order Kalman optimum smoothers are investigated. This performance is evaluated in terms of steady state covariance error computation, dynamic tracking, and noise response. It is shown that with practical amounts of memory, a second order smoother can have a position error due to an acceleration or jerk step input less than any prescribed maximum. As an example of importance to the NASA Deep Space Network, a second order smoother can be used to track the Voyager spacecraft at Uranus and Neptune encounters with significantly better performance than a second order phase locked loop.
Hurd W. J.
Raez A. P. C.
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