Differential data signal transmission technique
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United States of America Patent
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Sep 6, 1994
Grant Date -
N/A
app pub date -
Jun 24, 1993
filing date -
Jul 1, 1992
priority date (Note) -
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Abstract
Differential data signal transmission technique, providing a differential data signal transmission technique inclusive of the correcting factor that requires no transmitter/receiver other than the GPS receiver, comprises the use of a differential ranging system where spread spectrum signals (SS signal) are multiplied at the same frequency, transmission rate, and modulation method used by the GPS satellites, but with different codes from those used by the GPS satellites, the SS signals used to transmit correcting factor from an earth station on the ground to a mobile station on the ground carrying a GPS receiver via a geostationary orbit satellite or a low earth orbit satellite.
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