Method of processing signals of a satellite positioning system
US6157341A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1998 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Dec 18, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method of treating the L.sub.1 and L.sub.2 signals of a positioning system in which each of said L.sub.1 and L.sub.2 signals presents a single frequency carrier modulated by a known pseudo-random code P, itself modulated by an unknown code W, in which: PA1 a) each of the signals L.sub.1 and L.sub.2 is correlated in a respective system with a locally-generated replica of the P code; PA1 b) the first and second correlation signals obtained over a period equal to an estimated period for a bit of the W code are integrated to obtain respective first and second W code bit signals; and PA1 c) cross-correlated is then performed thereon. In the invention, between b) and c), a test is performed firstly to see whether the first and/or second W code bit signal is greater than a first positive threshold value or less than a first negative threshold value, and for the purposes of said cross-correlation, only those first and/or second W code bit signals are retained for which the corresponding test is satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.