Land vehicle navigation system
US4949268A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1988 |
| Grant date | Aug 14, 1990 |
| Priority date | — |
| Expiry date | Sep 22, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/426
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A land vehicle navigation system is adapted to display the present position of a vehicle by receiving signals from a combination of satellites under the global positioning navigation system. The present position of the vehicle is displayed on a screen, superposed over map data. To obtain the best global positioning data, the combination of satellites is selected in connectio with the visibility. To perform the positive reception of signals from the satellites as the vehicle is running in an urban area, data relating to the building height around the area can be obtained from a geographical information section including data indicative of the map and the building height distribution with respect to the area to determine the visibility.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.