Method of locating a fixed terminal using a constellation of satellites
US6195042A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1998 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Aug 24, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/0018
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of locating a fixed terminal of a telecommunication system comprising a constellation of satellites, a plurality of gateway stations and a plurality of fixed terminals includes "coarse", "intermediate" and "fine" location phases. During the "intermediate" location phase, the terminal calculates at least three hyperboloids and their intersection, assuming a "coarse" estimated position of the terminal is known. Each hyperboloid can be written: EQU H.sub.i,j :dj-di=(tj'-tj).c-(ti'-ti).c where: PA1 di is the distance between the terminal and the position pi of the ith active satellite at time ti, PA1 dj is the distance between the terminal and the position pj of the jth active satellite at time tj, PA1 ti and tj are the ith and jth times of transmission by the ith and jth satellites, respectively, of ith and jth information relating to ti and di and to tj and dj, respectively, PA1 ti' and tj' are the ith and jth times of reception by the terminal of the ith and jth information, and PA1 c is the speed of light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.