Communications – electrical: acoustic wave systems and devices – Sonar counter-measures
Patent
1993-06-21
1994-05-24
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Sonar counter-measures
342 22, G01S 1304
Patent
active
053155610
ABSTRACT:
A radar system is shown to include a transmitter for transmitting a pulsed electromagnetic signal having a frequency less than 500 Hz and a receiver for receiving a (scattered) reflected signal provided from the pulsed electromagnetic signal (scattered) reflected from an anomaly below the surface of the water. The radar system further includes a switch for inhibiting the receiver from receiving a reflected signal provided from the pulsed electromagnetic signal reflected from the surface of the water and a signal processor for controlling interoperability of the transmitter, the receiver and the switch. With such an arrangement, a radar system is provided for detecting anomalies such as a wake of a moving vessel (if and when this produces a conductivity anomaly), or a plume of oil beneath the surface of water.
REFERENCES:
patent: 3153236 (1964-10-01), Rines
patent: 3903520 (1975-09-01), Shostak
"Air/Undersea Communication at Ultra-Low-Frequencies Using Airborne Loop Antennas," A. C. Fraser-Smith et al., Stanford Electronics Laboratories, Jun. 1977, Technical Report No. 4207-6, pp. iii-vii-1-75.
Mofford Donald F.
Pihulic Daniel T.
Raytheon Company
Sharkansky Richard M.
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