A Reconstruction Method of Acoustic Pulse Signal in Underwater Acoustic Multi-channel Channel
A pulse signal and channel technology, applied to electrical components, transmission systems, etc., can solve the problems of low-pass filter loss of signal complex cepstrum information, strict construction conditions, large reconstruction errors, etc., to achieve subtle signal influence and construction The method is simple and the reconstruction error is small
Active Publication Date: 2015-09-30
HARBIN ENG UNIV
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The research results show that the low-pass filter will lose the complex cepstrum information of the high-time part of the signal, so the reconstruction error is relatively large; while the comb filter needs to estimate the time delay of each multi-path, and the construction conditions are strict
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[0022] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0023] Simulation conditions: the transmitted sound pulse signal is a single-frequency pulse signal weighted by the attenuation index, the center frequency is 1kHz, the sampling frequency is 10kHz, and the signal length is 0.2s. Sound source position (0,0,100) m, receiver position (50,50,50) m, sea depth 200m. In addition to the direct sound, the received signal also has a superposition of the reflected sound from the seabed and the sea surface. Fig. 1 is the time domain and complex cepstral domain waveform diagram of the transmitted acoustic pulse signal, and Fig. 2 is the channel impulse response time domain and complex cepstrum domain waveform diagram.
[0024] In the present invention, the reconstruction of the acoustic pulse signal under the underwater acoustic channel is mainly divided into three steps, and the specific flow chart is deta...
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The invention provides a pulse reconstruction method for sound of multipath underwater channel. The pulse reconstruction method includes the following steps of (1), transferring channel output signals from to a complex cepstrum domain through a convolution homomorphic feature system (2), filtering by a filter of the complex cepstrum domain which is constructed on the basis of an idea of peak search, that is to adopt the idea of peak search in the complex cepstrum domain based on the features of a complex cepstrum to automatically search for multipath peak pulse and to conduct the smooth processing so as to achieve the filtering of the multipath interference of the complex cepstrum (3), enabling the result after filtering to be through a convolution homomorphic inverse feature system and achieving the reconstruction of the pulse signals of the sound. According to the method, the priori knowledge, such as channel or signal parameters, is not required, the fast and varying channel is applicable, the method of constructing the feature filter is easy, and the reconstruction error is small.
Description
technical field [0001] The invention relates to an underwater acoustic signal processing technology method, in particular to a method for suppressing multi-channel influence in an underwater acoustic multi-channel channel and reconstructing an acoustic pulse signal. Background technique [0002] Pulse signal is one of the most commonly used signal forms in the field of underwater acoustics. Affected by the inhomogeneity of the seabed, sea surface and medium, the signal propagation in the ocean presents a multi-path characteristic. The transmitted signal arrives at the receiving point through different paths. Signal processing such as signal detection and parameter estimation brings great difficulties. Therefore, it is one of the key technologies of underwater acoustic signal processing to take effective measures to realize anti-channel multipath. [0003] According to the theory of ray acoustics, the output of the underwater acoustic channel can be equivalent to the time-d...
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IPC IPC(8): H04B13/02
Inventor 付进王燕梁国龙许琬琰张瑶林旺生
Owner HARBIN ENG UNIV