Method and apparatus for determining a geographical location of a mobile communication unit
US6246361A · kind A · utility
81Cited by
7References
43Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1999 |
| Grant date | Jun 12, 2001 |
| Priority date | — |
| Expiry date | Jun 28, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2205/006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The location of a mobile unit is determined by evaluating the instantaneous distances between an apparatus traveling above the surface of the earth and the mobile unit. The instantaneous distances are determined by measuring the travel time of a plurality of signals and calculating the distance based on the speed of the signal. One of two possible location regions is identified as the region including the location of the mobile unit by observing the motion of the mobile unit resulting from the rotation of the Earth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.