Diversity type global positioning system for motor vehicles
US5341301A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1991 |
| Grant date | Aug 23, 1994 |
| Priority date | — |
| Expiry date | Dec 23, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This diversity type GPS system for a vehicle has first and second antennas mounted at first and second locations, respectively, inside a vehicle. First and second high frequency amplifiers and an antenna changer apply the signals received by the first and second antennas to first and second SS demodulators. The first and second SS demodulators simultaneously perform search operations for satellites, and demodulate rf signals (demodulated data) from the searched out satellites. An arithmetic and control unit computes a position of the vehicle from the demodulated data once three or more sets of demodulated data are available. The arithmetic and control unit also controls the antenna changer to switch the antenna from which a demodulator receives signals so as to improve the searching operations of the demodulators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.