Cellular positioning system (CPS)
First Claim
1. Positioning system for locating a mobile body comprising a plurality of earth based spread spectrum (SS) broadcasting stations arranged geographically in a hexagonal cellular pattern, each said SS broadcasting station including a modulator providing a channel signal structure which is substantially orthogonal with respect to adjacent SS broadcasting stations in said hexagonal cellular pattern, each channel signal including navigation beacon data including:
- (a) a unique beacon identification, (b) station latitude and longitude, (c) time slot frequency and phase characterizations and (d) selected parameters of adjacent stations.
1 Assignment
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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 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.
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Citations
24 Claims
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1. Positioning system for locating a mobile body comprising a plurality of earth based spread spectrum (SS) broadcasting stations arranged geographically in a hexagonal cellular pattern, each said SS broadcasting station including a modulator providing a channel signal structure which is substantially orthogonal with respect to adjacent SS broadcasting stations in said hexagonal cellular pattern, each channel signal including navigation beacon data including:
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(a) a unique beacon identification, (b) station latitude and longitude, (c) time slot frequency and phase characterizations and (d) selected parameters of adjacent stations. - View Dependent Claims (2, 3, 4)
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5. Positioning system for locating a mobile body comprising a plurality of earth based spread spectrum (SS) broadcasting stations arranged geographically in a hexagonal cellular pattern, each said SS broadcasting station including a modulator providing a channel signal structure which is substantially orthogonal with respect to adjacent SS broadcasting stations in said hexagonal cellular pattern, each channel signal including navigation beacon data including:
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(a) a unique beacon identification, (b) station latitude and longitude, (c) time slot frequency and phase characterizations and (d) selected parameters of adjacent stations, each said modulator providing a GPS like direct sequence SS signal in which the navigation beacon is a PN coded broadcast, and receiver means for receiving the direct sequence SS signals from at least three of said SS broadcasting stations and determining the location thereof. - View Dependent Claims (6)
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7. A positioning apparatus suitable for use in an earth based spread spectrum (SS) broadcasting station among a plurality of earth based spread spectrum (SS) broadcasting stations arranged geographically in a cellular pattern in a communication system for locating a mobile body, each said SS broadcasting station outputting a channel signal that is substantially orthogonal with respect to channel signals output by adjacent SS broadcasting stations in said cellular pattern, the apparatus comprising a modulator suitable to output such a substantially orthogonal channel signal including navigation beacon data including:
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(a) a unique beacon identification, (b) station latitude and longitude, (c) time slot frequency and phase characterizations, and (d) selected parameters of adjacent stations. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A positioning apparatus suitable for use in a mobile body in a communication system having a plurality of earth based spread spectrum (SS) broadcasting stations arranged geographically in a pattern suitable for facilitating cellular communications, each SS broadcast station transmitting a navigation beacon that is substantially orthogonal with respect to navigation beacons transmitted from adjacent SS broadcasting stations in the cellular pattern, wherein the navigation beacons include:
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(a) a unique beacon identification, (b) station latitude and longitude, (c) time slot frequency and phase characterizations, and (d) selected parameters of adjacent stations, the positioning apparatus comprising a receiver configured to receive said navigation beacons from at least three of said SS broadcasting stations in the communication system and determine a location of the mobile body therefrom. - View Dependent Claims (14, 15, 16, 17)
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18. A method of determining a location of a mobile unit operating within a wireless communication system having a plurality of earth based broadcasting stations each transmitting a navigation beacon substantially orthogonal to navigation beacons transmitted by adjacent broadcasting stations, the method comprising:
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detecting on a control channel of a communication signal broadcast by one of the plurality of broadcasting stations a navigation message containing information concerning the navigation beacons transmitted by the plurality of broadcasting stations;
acquiring the navigation beacons transmitted by at least three of the broadcasting stations using the information contained in the detected navigation message and determining from the acquired navigation beacons range measurements to said at least three broadcasting stations; and
determining a position of the mobile unit based on the range measurements, wherein the navigation message includes identifiers of at least the adjacent broadcast stations and characteristics of the navigation beacons transmitted by the adjacent broadcast stations. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification