Enhancement of signal-detection capability of GPS systems
US6252545A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2000 |
| Grant date | Jun 26, 2001 |
| Priority date | — |
| Expiry date | Feb 4, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/27
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Estimated Global Position System (GPS) navigation data is used to increase the signal integration interval. In one embodiment, a WAG (wireless assisted GPS) server receives GPS signals and demodulates the navigation data modulated onto the GPS signals. The WAG server utilizes known features of the demodulated navigation data to generate estimated navigation data for the satellite. This estimation can be made several seconds or even minutes ahead of time. The wireless terminal uses this estimated navigation data to perform a data wipe-off operation to enable the integration interval to be increased (e.g., beyond 20 ms), thereby increasing overall signal-detection sensitivity at the wireless terminal. In another embodiment, information from strong GPS signals is used to detect weak GPS signals from other satellites. In this embodiment, strong GPS signals are received directly by the wireless terminal from the satellites. After strong GPS signals have been detected, the strong GPS signals are demodulated to compute satellite ephemerides including navigation data. The demodulated navigation data is then matched with known features of the navigation data to estimate the navigation data …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.