GPS receiver with cross-track hold
US6574558B2 · kind B2 · utility
175Cited by
132References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 24, 2002 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | May 24, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/70715
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A terrestrial C/A code GPS receiver system derives along-track position information while tracking as few as two GPS satellites by use of conventional altitude hold and a cross-track hold mode in which the maximum expected deviation of the vehicle from the expected track is estimated by, for example, knowledge or prediction of the width of the roadway or other track. To maintain accuracy, cross-track hold is alternated with clock hold to update the cross-track estimate when changes in vehicle direction are detected or when a predetermined period has elapsed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.