Vehicle location system
USRE35498E · kind E · reissue
Assignee
Inventor
Key dates
| Filing date | May 27, 1994 |
| Grant date | Apr 29, 1997 |
| Priority date | — |
| Expiry date | May 27, 2014 |
Classification
- Technology area (CPC —)General
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.