Pulse or digital communications – Repeaters – Testing
Patent
1994-12-23
1997-02-18
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375206, 370335, 370527, 379 63, 455 383, H04B 1500, H04K 100, H04L 2730
Patent
active
056047657
ABSTRACT:
A cellular telephone system having three or more cell sites with each cell site having a source of cellular communication signals and an RF transmitter and antenna for broadcasting the cellular communication signals. A direct sequence spread spectrum waveform carrying navigation signals is embedded in the cellular communication signals, including controlling the signal strength of the navigation signals so that the combined energy of the navigation signals from all cell sites at any location is at least a predetermined energy level below the energy level of the cellular communication signals. Each cell site includes timing for timing the operation of a GPS receiver. An RF signpost system comprising a plurality of low powered RF broadcast stations, one each at a plurality of scattered geographic locations, each low powered RF broadcast station broadcasting a direct sequence spread spectrum digital RF waveform and a modulator to modulate the digital RF waveform with location information identifying the geographic locations, respectively.
REFERENCES:
patent: 4232317 (1980-11-01), Freeny et al.
patent: 5235633 (1993-08-01), Dennison et al.
Bruno Ronald
Engelbrecht Lloyd
Schuchman Leonard
Chin Stephen
Stanford Telecommunications, Inc.
Vo Don
Zegeer, Esq. Jim
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