System and method for automatic recovery and covariance adjustment in linear filters
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United States of America Patent
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Feb 22, 2011
Grant Date -
Feb 4, 2010
app pub date -
Jul 31, 2007
filing date -
Jul 31, 2007
priority date (Note) -
Expired
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Abstract
A communications device includes a time/frequency error measurement circuit that receives a communications signal and measures its timing and frequency errors. A Kalman filter receives the communications signal from the time/frequency error measurement circuit and processes the signal using a multi-level state error covariance matrix P for controlling the Kalman gain in the Kalman filter. An on-line monitoring circuit is operative with the Kalman filter for monitoring the actual state errors in time and frequency and controlling the state error covariance matrix P based on a measured error threshold.
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