Cellular positioning system (CPS)
USRE38808E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2002 |
| Grant date | Oct 4, 2005 |
| Priority date | — |
| Expiry date | Aug 29, 2022 |
Classification
- Technology area (CPC —)General
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.