Chirped spread spectrum positioning system

Details Chirped spread spectrum positioning system Chirped spread spectrum positioning system

1995-02-23

1997-12-23

Ghebretinsae, Temesghen

Pulse or digital communications

Repeaters

Testing

342357, 455 331, H04K 600, H04B 7185

Patent

active

057013284

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 slot and phase 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. 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. GPS satellite signals can be used for timing control.

REFERENCES:
patent: 4882694 (1989-11-01), Brubaker et al.
patent: 5309474 (1994-05-01), Gilhousen et al.
patent: 5497395 (1996-03-01), Jou

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