System and method for acquiring geographic data for forming a digital database of road geometry in a geographic region
US5999878A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1997 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Apr 11, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C15/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system and method for acquiring differentially corrected GPS data for forming a digital database of road geometry in a geographic region. A vehicle having a GPS receiver and a DGPS demodulator located therein is driven on roadways in the geographic region. The GPS receiver receives standard GPS signals and the DGPS demodulator receives DGPS signals which are used to correct the standard GPS signals. The corrected GPS signals are stored where they can be processed to create a digital database. Alternately a GPS receiver is positioned at a stationary location along with a portable DGPS demodulator. A vehicle having a GPS receiver located therein is driven on roadways in the geographic region. The GPS receiver at the stationary location is continuously operated and the DGPS demodulator is operated once to receive a DGPS signal. The DGPS demodulator can then be moved to another geographic region. The GPS receiver in the vehicle is operated as the vehicle is being driven and the GPS receiver receives standard GPS signals. The standard GPS signals from the GPS receiver at the stationary location can be used to correct the standard GPS signals received by the GPS receiver in the vehicle…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.