Active detection system using simultaneous multiple...

Details Active detection system using simultaneous multiple... Active detection system using simultaneous multiple...

G - Physics

01

S

349/25, 343/50

G01S 15/06 (2006.01) G01S 7/52 (2006.01) G01S 15/66 (2006.01) G01S 15/74 (2006.01) G01S 15/89 (2006.01)

Patent

CA 1177572

ABSTRACT OF THE DISCLOSURE A system for detection by an echo containing transmission and reception sources for detection by acoustic waves in particular. A circular base contains N columns T1, T2,..Ti,..TN of electroacoustic trans- ducers. To each column, such as Ti, corresponds a transmission at the frequency fi. 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 Vk, the signals are filtered at frequencies f1, f2..fN, which are applied to time offset circuits taking into account the base geometry and the channel direction. The signals obtained, such as di.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.

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