Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent
1985-03-15
2000-10-10
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
G01S 1500
Patent
active
061308579
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.
REFERENCES:
patent: 3610901 (1971-10-01), Lynch
patent: 3878526 (1975-04-01), Pedersen
patent: 4206510 (1980-06-01), Strait
patent: 4349897 (1982-09-01), Boehme et al.
patent: 4398274 (1983-08-01), Chotiros
Alsup James M.
Sullivan Shelby F.
Williams Jack R.
Fendelman Harvey
Kagan Michael A.
Pihulic Daniel T.
Rusche Edmund W.
The United States of America as represented by the Secretary of
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