Fixed site data-aided GPS signal acquisition method and system
US6300899A · kind A · utility
Inventor
Key dates
| Filing date | Feb 19, 1999 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Feb 19, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/70715
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fixed site data-aided system and method of GPS signal acquisition from a plurality of broadcasted GPS signals includes lengthening a pre-detection integration interval so that weak signals can be detected by operating coherently on captured signals. Coherency is ensured by relying on the predictability of the satellite signal's data pattern. To speed up both the real-time and off-line correlation process a reduced code replica search space is derived dependent on a reference code phase delay and reference Doppler shift (417), and optionally local time (509) received from a fixed position reference site. Also, the off-line correlation process can be run at a speed significantly faster than the real-time correlation process. A position fix can be either computed locally or remotely at the fixed position reference site.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.