Active detection system using simultaneous multiple transmission

Details Active detection system using simultaneous multiple transmission Active detection system using simultaneous multiple transmission

1981-03-17

1983-09-06

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

343 55A, 343 5FT, 367 11, 367101, G01S 1542

Patent

active

044033141

ABSTRACT:
A system for detection by an echo containing transmission and reception sources for detection by acoustic waves in particular. A circular base with N columns T.sub.1, T.sub.2, -T.sub.i,-T.sub.N of electroacoustic transducers. To each column such as T.sub.i corresponds a transmission at the frequency f.sub.i. A switch makes it possible to change from transmission to reception. The signals received are applied to a channel forming device. For each channel such as V.sub.k the signals are filtered at frequencies f.sub.1, f.sub.2, -f.sub.N, which are applied to time offset circuits taking into account the base geometry and the channel direction. The signals obtained such as d.sub.i.k are applied to a display device which supplies the range, direction and speed of the targets detected. This is particularly applicable to underwater surveillance by sonar or radar.

REFERENCES:
patent: 3680100 (1972-07-01), Woerrlein
patent: 3680105 (1972-07-01), Goldstone
patent: 3771116 (1973-11-01), Farrah
patent: 3956749 (1976-05-01), Magorian
patent: 4119940 (1978-10-01), Keating et al.
patent: 4222050 (1980-09-01), Kiuchi et al.
patent: 4288866 (1981-09-01), Sackman

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