Underwater transponder calibration arrangement
US4097837A · kind A · utility
Inventor
Key dates
| Filing date | Mar 29, 1976 |
| Grant date | Jun 27, 1978 |
| Priority date | — |
| Expiry date | Mar 29, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/874
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An arrangement for determining the relative three dimensional positional relationship, including the horizontal separation, location, and orientation between a plurality of underwater transponders. A plurality of underwater transponders are positioned adjacent the bottom of the body of water and the number of the plurality of transponders for an unambiguous determination comprises at least three. In one embodiment, each of the transponders is provided with structure to receive a first interrogation frequency signal and generate a unique output signal in response thereto. Additionally, a first of the transponders also is provided with structure to generate the first interrogation frequency signal in response to a second interrogation frequency signal. A second of the plurality of transponders is provided with structure to generate the first interrogation frequency signal in response to a third interrogation frequency signal. A base station which, for example, may be a ship located at first location on the surface of the water within signal range of each of the transponders has structure for generating each of the first, second and third interrogation frequency signals in a predeterm…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.