Navigation system
US7711481B2 · kind B2 · utility
1Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 3, 2007 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | Jun 20, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04R20/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A navigation system for use in a vehicle receives a GPS signal for having a GPS time data that rolls over at an interval of 19.7 years with a start time of 0 a.m. Jan. 6th, 1980 from a GPS satellite, and acquires map generation date information that specifies map data generation time from map database in the navigation system. The GPS time data and the map data generation time information are utilized for calculating an accurate current date and time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.