Global positioning system
US5210540A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1992 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | Jun 12, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A global positioning system for positioning a mobile object such as an automobile in a global geometrical region includes a GPS receiver for receiving radio waves from a plurality of satellites and outputting either two-dimensional position data indicative of the present position of the mobile object in a two-dimensional position measurement mode or three-dimensional position data indicative of the present position of the mobile object in a three-dimensional position measurement mode. An altimeter detects a relative altitude of the mobile object and outputs relative altitude data indicative of the detected relative altitude. A present position output unit calculates present position data indicative of the present position of the mobile object solely based on the data from the GPS receiver while the GPS receiver is operating in the three-dimensional position measurement mode. When the GPS receiver operates in the two-dimensional position measurement mode, the present position output unit calculates present position data indicative of the present position of the mobile object based on the two-dimensional position data and the relative altitude data. The calculated present position da…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.