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Shallow sea multi-path sound signal decomposition method

A technology of signal decomposition and multi-channel sound, which is applied in the direction of sound wave re-radiation, re-radiation utilization, and measurement devices, can solve the problems of inability to reflect the frequency and phase characteristics of sub-channels, achieve improved decomposability, simplified operating procedures, Strong operability effect

Active Publication Date: 2015-04-22
HARBIN ENG UNIV
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AI Technical Summary

Problems solved by technology

This method simplifies the effect of sound rays on sound waves, and cannot reflect the frequency and phase characteristics of each sub-channel, which has great limitations
In shallow seas, what impact each multi-channel sub-channel has on the transmitted signal, and how to separate each multi-channel sub-signal, at present, there are few reports at home and abroad that discuss this direction in depth

Method used

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  • Shallow sea multi-path sound signal decomposition method
  • Shallow sea multi-path sound signal decomposition method
  • Shallow sea multi-path sound signal decomposition method

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Embodiment Construction

[0029] The following will combine figure 1 ~ Fig. 8 illustrates the present invention in further detail.

[0030] Shallow sea multi-channel sound signal decomposition method of the present invention is divided into the following steps:

[0031] (1) The distribution of sonar transmitters and receivers is as follows: figure 2 shown;

[0032] (2) Use the electrical signal x(t) to drive the sonar emission device, as shown in Figure 4(a);

[0033] (3) The sound pressure signal received by the sonar receiving device is y(t), as shown in Figure 4(b);

[0034] (4) Do a fractional Fourier transform on the signal y(t), and take the optimal order (let α=α at this time 0 ) output, the output is the curve of time-frequency domain u and amplitude, such as Figure 5 shown;

[0035] (5) extraction Figure 5 The value u of the 7 main peaks in the u domain i (i=0,1,…,6), and use formula (2) to convert to delay parameter τ i (i=0,1,...,6);

[0036] τ i...

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Abstract

The invention discloses a shallow sea multi-path sound signal decomposition method. The shallow sea multi-path sound signal decomposition method includes the following steps that a sonar emitting device emits signals, and a sonar receiving device receives signals; the delay of each multi-path sound signal is extracted from the received signals; the emitted signals are delayed according to the extracted delay, and an actual source signal and N-1 virtual source signals are obtained; the obtained actual source signal and N-1 virtual source signals serve as input, the received signals serve as output, and an ARX model is constructed; the kth virtual source signal serves as input and fed into the ARX model, the other k-1 virtual source signals are set as 0, and a sound signal is obtained; it is made that k=k+1, the former step is repeated until k=N, and N sound signals are obtained. The shallow sea multi-path sound signal decomposition method effectively improves the decomposability of the multi-path signals.

Description

technical field [0001] The invention belongs to the field of signal processing, and in particular relates to a method for decomposing multi-channel sound signals in shallow seas, which can obtain various multi-channel sub-signals. Background technique [0002] Most of China's sea areas are shallow seas, and many hydroacoustic equipment work in shallow seas. A key factor affecting sound propagation and reception in shallow seas is multi-path interference, which causes intersymbol interference in underwater acoustic communication systems and affects communication rates; in target echo testing, the incident waves of the target are aliased in time and space, There is no way to get the target's response in a fixed direction. Multi-channel signal separation can reduce reception interference and improve the performance of equipment in shallow seas. The study of multi-channel signal separation in shallow sea has important theoretical significance and practical value. [0003] The...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/527G01S7/536G01S15/02
CPCG01S7/527G01S7/536G01S15/02
Inventor 赵安邦何呈惠娟牛芳宋雪晶祝令国程越曾才高毕雪洁马琳
Owner HARBIN ENG UNIV
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