Robust underwater acoustic channel estimation method based on joint norm optimization

Abstract

The invention provides a robust underwater acoustic channel estimation method based on joint norm optimization. A detection signal is sampled to obtain a discrete time sequence; a cost function of underwater acoustic channel response estimation is established on the basis of the thought of joint norm optimization; a support domain of a channel function is defined by using a matched filtering method; and a channel estimation result is modified, and loop iteration is continued to obtain estimation of underwater acoustic channel pulse response. The cost function based on joint norm of a channel response function is constructed through the sparsity of an underwater acoustic channel, so that the requirement of an algorithm on the signal to noise ratio is lowered effectively. Meanwhile, the resolution capability of multipath time delay is enhanced; the problems of heavy computation, large storage amount and high time consumption in channel estimation are solved; and the 'false peak' effect occurring in channel estimation is reduced.

Description

technical field [0001] The invention relates to the field of underwater communication, especially a signal processing method. Background technique [0002] When the signal sent by the transmitting transducer is transmitted through the ocean channel, the hydrophone received signal x(t) can be modeled as the linear convolution of the original transmitted signal s(t) and the channel function h(t) and superimposed on the ocean environment noise n ( t ) : x ( t ) = s ( t ) ⊗ h ( t ) + n ( t ) = ∫ s ( t - τ ) h ( τ ...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies of the prior art and solve the problems of insufficient accuracy of the existing underwater acoustic channel estimation method under the condition of low signal-to-noise ratio, insufficient resolution of multipath time delay, and large amount of computation and storage, the present invention uses a single hydroacoustic The received data and the detection signal of the detector, the channel function estimation value is obtained by joint norm optimization of the channel function, and then the estimated result is corrected by using the matched filter which is not sensitive to the signal-to-noise ratio, and the matrix operation is transformed into a fast algorithm Vector operation realized by FFT / IFFT, so as to realize fast and accurate estimation of underwater channel

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