Doppler correction for a high-speed mobile station in a satellite mobile telephone system
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United States of America Patent
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Issued Date -
Nov 21, 2002
app pub date -
Dec 31, 2001
filing date -
Mar 30, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Doppler-shift correction information broadcast in a satellite mobile telephone system is produced on the assumption that mobile stations (4a, 4b) are stationary or moving slowly. Consequently, a mobile station (4a, 4b) moving at high-speed cannot correct properly for Doppler shift. In order to solve this problem, provision is made for the mobile station (4a, 4b) to know its own position and velocity, as well as that of a satellite (3a, 3b), so that it can tune its transmitter to mimic, from the perspective of the satellite (3a, 3b), a stationary or slowly moving mobile station (4a, 4b).
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