Position surveillance using one active ranging satellite and time of arrival of a signal from an independent satellite
US4161734A · kind A · utility
45Cited by
3References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 17, 1977 |
| Grant date | Jul 17, 1979 |
| Priority date | — |
| Expiry date | Oct 17, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The position of a ship or other object being located is determined at an earth station using an active ranging satellite and a satellite which transmits time signals. One line of position is determined by two-way active ranging through the first satellite. The other line of position is determined by one-way ranging from the second satellite. The time interval between the time of arrival of the timing signal at the ship and reception of the active ranging signal at the ship is measured and sent back to the earth station with the ship's active ranging response. The position fix is then computed at the earth station.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.