Differential data signal transmission technique

Details Differential data signal transmission technique Differential data signal transmission technique

1993-06-24

1994-09-06

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

G01S 0502

Patent

active

053452453

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.

REFERENCES:
patent: 5222099 (1993-06-01), Hori et al.
patent: 5225842 (1993-07-01), Brown et al.
patent: 5245628 (1993-09-01), LaPadula, III et al.
Sky Fix and Delta Fix SR, Differential GPS Products, Racal Positioning Systems Limited, New Malden, Surrey KT3 4NR, England (six pages of descriptive material and specification).

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