Method of resetting sonar images using secondary antenna
US6240050A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1999 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Jul 19, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/8904
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of readjusting sonar images using sub-antennae. For each point of the bottom, a sub-antenna is constructed of a given size at one end of the physical antenna. A first channel is constructed over a short time slice centered on the point. A sub-antenna is also constructed upon recurrence No. 2 of the same size as the first one, but at the opposite end of the physical antenna. With the second sub-antenna, a plurality of second channels is formed over a sector which is sufficiently wide to contain the point. These second channels are intercorrelated with the first channel so as to adopt the one which maximizes the intercorrelation peak. This procedure is repeated for different sub-antenna sizes and one is adopted which produces the maximum of the preceding intercorrelations. The best estimate of the position of the point in the second sonar image is deduced from the azimuth shifts between the first channel and the best second channel, from the intercorrelation delay between these channels and from the best sub-antenna size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.