Reduced-power GPS-based system for tracking multiple objects from a central location
US5752218A · kind A · utility
58Cited by
11References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1997 |
| Grant date | May 12, 1998 |
| Priority date | — |
| Expiry date | Aug 25, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Location of an object to be tracked is determined by measuring, at a receiver situated at the object, the propagation time differences between the signals from a plurality of GPS satellites, each of which is received by the receiver situated at the object. The measured propagation time difference values are transmitted to a central station where the location of the object to be tracked is calculated based upon the propagation time differences of the signals transmitted from the satellites and data derived from a receiver apart from the object but also receiving signals from the satellites.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.