AURAL ENHANCEMENT OF ACTIVE SONAR SYSTEMS
Assignee
UNITED STATES OF AMERICA AS REPRESENTED BY THE SECREATRY OF THE NAVY
Filed
Mar 15, 1985
Granted
Oct 10, 2000
Location
ANAHEIM CA US
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: Google Patents
35 USC §181 Secrecy Order
Imposed
May 14, 1987
Rescinded
Nov 5, 1999
Duration
12 years, 5 months
Inventor
- 1JACK R. WILLIAMS
Record Details
- Patent number
- US 6130857
- Application
- 06795481
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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