Method of compensating for the movement of the antenna for a...

Details Method of compensating for the movement of the antenna for a... Method of compensating for the movement of the antenna for a...

G - Physics

01

S

G01S 15/50 (2006.01) G01S 7/52 (2006.01) G01V 1/38 (2006.01)

Patent

CA 2108449

2108449 9218878 PCTABS00017 A method for towed sonar arrays, wherein antenna movement is electronically compensated to suppress the Doppler shift in the fixed echoes. For this purpose, a series of M sensors in a towed linear antenna (203) which includes N sensors (205), and where M < N, are selected and electronically switched so that they scan the antenna in a phantomlike manner in the opposite direction to antenna movement and at twice its forward speed. To avoid having too many physical sensors, their signals are interpolated to obtain a sufficient number of phantom sensors to reduce the increment of the phantom sub-antenna's movement and thereby suppress the interfering lobes caused by the incremental nature of said movement. The method allows the sensitivity of sonars to be increased without increasing their power.

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