FIELD: searching and detecting marine objects.
SUBSTANCE: invention is related to one of the important areas of theory and practice of covering the hydroacoustic situation in the sea. In the proposed invention, the emission and reception paths are divided into two channels each, namely, the emission of probing and the reception of echo signals on one channel is carried out at a frequency f1, on the other channel at a close (difference ± 10%) frequency f2, while the outputs of both receiving channels are fed to a filter adder that extracts the spectrum component of the signal at the difference frequency f3 = f1-f2, which reduces the loss in propagation of the echo signal with an increase in the noise resistance of the receiving channel at the difference frequency maintaining the concentration coefficient of the probing signal during its emission.
EFFECT: increased noise resistance of the receiving channel by increasing the signal-to-noise ratio.
2 cl, 2 dwg, 1 tbl
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