Pulse coded sonar having improved doppler determination feature

Details Pulse coded sonar having improved doppler determination feature Pulse coded sonar having improved doppler determination feature

1968-01-23

1997-07-15

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Echo systems

Speed determination

367131, G01S 1500

Patent

active

056489404

ABSTRACT:
The signal appearing at the receiver input of a pulse code active sonar dng a return echo period, is sampled, time compressed and stored in a memory. The time compressed sample is successive read-out of memory, with each individual "read-out" hetrodyned with a discretely different doppler compensation frequency signal. The successively processed read-outs are passed through an "on line" correlation detection device to determine presence of a correctly compensated pulse code echo.

REFERENCES:
patent: 3046545 (1962-07-01), Westerfield
patent: 3158830 (1964-11-01), Clay, Jr.
patent: 3167738 (1965-01-01), Westerfield
patent: 3183478 (1965-05-01), Slawsky et al.
patent: 3290649 (1966-12-01), Whitehouse
patent: 3302162 (1967-01-01), Rowlands

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