Calibrated method and device for narrow band Doppler compensation
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United States of America Patent
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Mar 10, 1992
Grant Date -
N/A
app pub date -
Sep 29, 1989
filing date -
Sep 29, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A Doppler compensating device which conserves power and can be used with hand-held communication devices comprises a phase lock loop for tracking a Doppler phase offset and a Doppler offset calibration loop which generates a Doppler offset curve. The Doppler offset calibration loop extracts Doppler offset points from the phase lock loop, and from these points calibrates a set of three parameters defining the Doppler offset curve using an estimation algorithm such as the least squares algorithm. After the curve is defined, the compensation device extracts points from the Doppler offset curve and deactivates the phase lock loop. This process preserves power within the hand-held communication devices.
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