Undersea sonar scanner correlated with auxiliary sensor trace

Details Undersea sonar scanner correlated with auxiliary sensor trace Undersea sonar scanner correlated with auxiliary sensor trace

1981-08-17

1983-12-20

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367106, 340850, G01S 1589

Patent

active

044221665

ABSTRACT:
The output of an auxiliary sensor, such as a magnetometer or metal detector, is recorded along side a sonar trace record, such as from a side scan sonar or sonar sub-bottom profiler, using the same recorder mechanism. In one embodiment, the added information permits correlation on the same chart between sonar generated impressions and local magnetic field disturbances such as produced by magnetically susceptible objects located on or below the seabed. The sonar record is typically provided as a series of adjacent scan lines, intensity modulated in accordance with the intensity of a received sonar echo. A conversion circuit transforms the output of the auxiliary sensor into a format consistent with the sonar scan trace whereby the sensor output is directly reproduced as a part of the sonar trace record, typically at a peripheral edge portion where the sonar image is absent. The auxiliary sensor and sonar detectors are typically located in the same "towfish" which is towed above the bottom being searched by a tending vessel.

REFERENCES:
patent: 2605341 (1952-07-01), Vacquier et al.
patent: 2958280 (1960-11-01), Gilfillan et al.
patent: 3673552 (1972-06-01), Mross et al.
patent: 3719920 (1973-03-01), Grada et al.
patent: 4075599 (1978-02-01), Kosalos et al.
Markus, Guidebook of Electronics Circuits, p. 507, 1975.

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