Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1993-10-13
1996-12-10
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
342353, 342386, G01S 502, G01S 108, H04B 7185
Patent
active
055835139
ABSTRACT:
A GPS system that includes a GPS beacon beacon that receives a plurality of GPS signals. Each of the GPS signals haa a carrier component and a pseudo-random code component. The beacon generates in response to the received GPS signals a plurality of beacon signals. Each of the plurality of beacon signals has a carrier component phase locked to one of the carrier components of the received GPS signals and a pseudo-random code component phase locked to one of the pseudo-random code components of the received GPS signals. The beacon then transmits the plurality of beacon signals. The system also includes a GPS receiver. The GPS receiver can make Code Based Differential GPS position determinations by making range measurements for each of the pseudo-random code components of the GPS and beacon signals and in response computing values representing a position. Additionally, the GPS receiver can make Carrrier Phase Differential GPS position determinations by first making phase measurements for each of the carrier components of the GPS and beacon signals at a plurality of measurment epochs during an initialization period. It then computes initialization values in response to these phase measurements for the GPS and beacon signals. Then, at a subsequent epoch after the initialization period, it computes a position in responsive to the initialization values and in response to the phase values for the GPS and beacon signals measured at the subsequent measurment epoch.
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Board of Trustees of the Leland Stanford Junior University
Issing Gregory C.
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