Bottom tracking system
US5122990A · kind A · utility
36Cited by
30References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1991 |
| Grant date | Jun 16, 1992 |
| Priority date | — |
| Expiry date | Feb 1, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/101
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system and method for bottom tracking in a sonar system. The present invention provides for convolving the received signal with the second derivative, or an approximation thereof, of the matched transmitted pulse. In another aspect of the invention, the received signal is convolved with the matching transmitter pulse and the result is evaluated by summing the differences between a central peak and its neighboring left and right values. The filtering of the present invention removes the effect of water absorption on signal amplitude. The invention also includes compensating for spreading loss in the received signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.