Aural enhancement of active sonar systems
US6130857A · kind A · utility
1Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1985 |
| Grant date | Oct 10, 2000 |
| Priority date | — |
| Expiry date | Mar 15, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03993
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system is presented for enhancing sonar signals wherein Doppler echoes eived in the time domain from a sonar system are processed by digitizing, shifting to baseband, Fourier transforming to the frequency domain, applying a frequency stretching algorithm designed to expand low Doppler signals, retransforming the signal back to the time domain, reshifting from baseband to original center frequency, converting to analog and outputting the resultant enhanced Doppler time domain signals to either earphones of a sonar operator for audio monitoring or for further processing for visual display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.