Underwater acoustic pulse echo ranging method based on time reversal
A technology of time reversal and echo ranging, which is applied in the direction of radio wave measurement system, measurement device, sound wave reradiation, etc., can solve the problems of output waveform distortion, strong reverberation, unfavorable accurate estimation of arrival time, etc. Accuracy, eliminate signal distortion, improve the effect of ranging accuracy
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[0018] Aiming at the problem that the underwater multipath effect affects the timing accuracy and thus the ranging accuracy, the present invention proposes a pulse echo ranging method based on time reversal.
[0019] Main steps of the present invention are as follows:
[0020] Step 1: Transmit detection pulse signal
[0021] The detection pulse signal of the ranging system is denoted as s(t), and the transmission time is denoted as τ 1 .
[0022] Step 2: Receive target reflection signal
[0023] The ranging system receives the echo signal,
[0024]
[0025] In the formula, is the underwater acoustic multipath channel under the ray model, s(t) is the detection pulse signal transmitted in the first step, t is the time variable, * is the convolution operation, ∑ is the summation symbol, n is the channel multipath path variable, N is Number of channel multipaths, A n is the amplitude corresponding to the nth path, ξ n is the delay corresponding to the nth path, and d(t)...
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