Methods and apparatuses of positioning a mobile user in a system of satellite differential navigation
US6268824A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1999 |
| Grant date | Jul 31, 2001 |
| Priority date | — |
| Expiry date | Sep 18, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Satellites of the GPS and GLONASS navigation systems broadcast code signals which are modulated onto respective carrier signals, and which are received by two receivers on Earth. The first receiver is situated at a point with known coordinates. The results of its measurements are transmitted to a user at a second receiver through a connection link, the user being interested in knowing his or her positioning. The second receiver is similar to the first receiver and it receives the signals of the same satellites. By processing data from the measurements of code delays and carrier phase shifts in the satellite signals received by two receivers, the methods and apparatuses of the inventions of the present application determine the location of the user with high precision and make the time indications of receiver clocks more accurate and exact. In the first invention, the measurements of two receivers are related to a common time moment by extrapolating measurement data that has arrived through the connection link with a delay. This common time moment is defined by the user. An extrapolating unit examines the measurements to find and discard measurements with abnormal errors. The unit t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.