Vehicle location system
US5119102A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 23, 1991 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Jan 23, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/41
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Signals from a number of NAVSTAR global positioning system (GPS) satellites (11,12,13,14) are received by a receiver (16) in a vehicle (15) and a segment of the signals is stored in a memory (18) prior to retransmission by a transmitter (19). A base station (35) receives these transmissions from the mobile unit using a first receiver (36). The base station also receives signals directly from the NAVSTAR GPS satellites using a second receiver (38). A control and calculating apparatus (37) within the base station can determine the ephemeris (course) information for the satellites and can measure the transmission times or propagation delays of signals between the satellites and the vehicle and with this information the control and calculating apparatus can calculate the position of the vehicle unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.