Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1995-02-23
2000-08-29
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
342361, 455 331, H04B 7185, G01S 502
Patent
active
06111538&
ABSTRACT:
Positioning system for locating a mobile body comprising a plurality of earth based spread spectrum (SS) broadcasting stations arranged geographically in a cellular pattern. Each SS broadcasting station include a modulator providing a channel signal structure which is substantially orthogonal with respect to adjacent stations in the cellular pattern, each channel signal including navigation beacon data including a unique beacon identification, station latitude and longitude, time.sub.-- slot and phase characterizations and selected parameters of adjacent stations. In one embodiment, each modulator provides a chirped SS signal in which the navigation beacon is a frequency tone that is repeatedly swept over a selected frequency band for each station. In a further embodiment, each modulator provides a GPS like direct sequence SS signal in which the navigation beacon is a PN coded broadcast. A receiver on the mobile body receives the SS signals from at least three of the SS broadcasting stations and determines the location thereof. A fourth SS broadcasting station provides altitude. CPS satellite signals can be used for timing control.
REFERENCES:
patent: 5379320 (1995-01-01), Fernandes et al.
patent: 5420592 (1995-05-01), Johnson
Bruno Ronald
Engelbrecht Lloyd
Schuchman Leonard
Weinberg Aaron
Blum Theodore M.
Stanford Telecommunications, Inc.
Zegeer Jim
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