Chirped spread spectrum positioning system
First Claim
1. Positioning system comprising a plurality of earth based spread spectrum (SS) broadcasting stations arranged geographically in a cellular pattern, each said SS broadcasting station including a modulator providing a chirped SS signal structure in a channel which is orthogonal with respect to the SS signal structure of adjacent stations in said cellular pattern, each channel signal including navigation beacon data, and different phase for adjacent stations.
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Accused Products
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.
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Citations
7 Claims
- 1. Positioning system comprising a plurality of earth based spread spectrum (SS) broadcasting stations arranged geographically in a cellular pattern, each said SS broadcasting station including a modulator providing a chirped SS signal structure in a channel which is orthogonal with respect to the SS signal structure of adjacent stations in said cellular pattern, each channel signal including navigation beacon data, and different phase for adjacent stations.
- 4. Positioning system comprising a plurality of earth based spread spectrum (SS) broadcasting stations arranged geographically in a cellular pattern, each said SS broadcasting station including a modulator providing a chirped SS signal structure in a channel which is orthogonal with respect to the SS signal structure of adjacent stations in said cellular pattern, each channel signal including navigation beacon data, and different phase for adjacent stations including receiver means for receiving the SS signals from at least three of said SS broadcasting stations and determining the location thereof.
Specification