Adaptive cancellation method for interference of underwater reverberation

Abstract

The objective of the invention is to provide an adaptive cancellation method for an interference of underwater reverberation. The method comprises the following steps that: splitting beam formation is carried out on receiving signals of N array elements so as to form left and right homodromous wave beam outputs x1 and x2; and the left and the right wave beams are respectively formed by M array element data wave beams; phase inversion processing is carried out on the left wave beam output data and then the processed left wave beam output data is added by the right wave beam output data; and added data is utilized as a reference signal of an adaptive reverberation canceller; adaptive reverberation cancellation is carried out respectively on the left wave beam signal x1 and the right wave beam signal x2, wherein the adaptive reverberation canceller is an adaptive filter with an FIR structure, the input signal is a wave beam output signal and the reference signal is data d that is obtained by addition of the left wave beam output data that has been processed by the phase inversion processing and the right wave beam output data; and multiplication and integration processing is carried out on two outputs e1 and e2 after the adaptive reverberation canceller by the left and the right wave beam signals so as to obtain a final output y. According to the invention, the reverberation interference is further inhibited and the detection performance is improved.

Description

technical field [0001] The invention relates to a target echo signal detection method in the field of sinking target detection. Background technique [0002] The existing adaptive noise cancellation method applied to underwater reverberation adaptive cancellation has achieved certain results, but its disadvantage is that the reference signal often contains the target echo signal, which makes the reverberation cancelled, but also the target echo signal. The echo signal also cancels out, so the target cannot be effectively detected. Contents of the invention [0003] The object of the present invention is to provide an adaptive cancellation method of underwater reverberation interference for target echo signal detection in the underwater reverberation background. [0004] The purpose of the present invention is achieved like this: [0005] The present invention is an adaptive cancellation method for underwater reverberation interference, which is characterized in that: ...

AI Technical Summary

Problems solved by technology

[0002] The existing adaptive noise cancellation method applied to underwater reverberation adaptive cancellation has achieved certain results, but its disadvantage is that the reference signal often contains the target echo signal, which makes the reverberation cancelled, but also the target echo signal. The echo signal is also canceled out, so the target cannot be effectively detected

Images