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Noise inhibiting method in vertical array receiving signal cross spectrum arra yevaluation in sea

A technology of cross-spectrum matrix and receiving signals, which is applied in the field of underwater acoustic signal processing

Active Publication Date: 2007-02-28
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0047] The purpose of the present invention is to overcome the deficiencies of the prior art in the noise suppression method for the estimation of the cross-spectrum matrix of the vertical array received signal, and provide a new noise suppression method, which can have a longer statistical time in order to further suppress the noise component in the estimation of the cross-spectrum matrix

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  • Noise inhibiting method in vertical array receiving signal cross spectrum arra yevaluation in sea
  • Noise inhibiting method in vertical array receiving signal cross spectrum arra yevaluation in sea
  • Noise inhibiting method in vertical array receiving signal cross spectrum arra yevaluation in sea

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Embodiment Construction

[0071] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0072] (1) The vertical array at the first sampling time t 0 and with the first sampling instant t 0 Multiple adjacent sampling moments receive signals from the target sound source. In one embodiment, the first sampling moment t 0 Adjacent multiple sampling instants refer to t 0 N sampling moments before and after the adjacent ones. These sampling instants are denoted by t n = t 0 +nT means that the value of n is from -N to N. When n is a negative number, it means that the sampling moment is at t 0 Before, when n is a positive number, it means that the sampling moment is at t 0 Afterwards, when n is zero, it represents the first sampling instant t 0 . It should be understood that at the selected first sampling instant t 0 After that, the selection of other sampling moments can be changed in many ways, which does not affect t...

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Abstract

The present invention discloses noise inhibiting method in cross spectrum matrix evaluation of marine vertical array signal reception. The vertical array receives the signal the target sound source sends in the first sampling time and the adjacent sampling times. One first cross spectrum matrix is constituted with the signal received in the first sampling time, and several second cross spectrum matrixes are constituted with the signal received in the adjacent sampling times. The second cross spectrum matrixes are frequency shifted relatively to the first one to make the effective signal channel component in each of the second cross spectrum matrixes equal to that in the first one. The first cross spectrum matrix and the frequency shifted second cross spectrum matrixes are statistically averaged to obtain the cross spectrum matrix evaluation in the first sampling time. The said method has one over 10 dB higher S / N ratio compared with convenient statistical method.

Description

technical field [0001] The invention relates to the field of underwater acoustic signal processing, and more specifically, relates to a noise suppression method used in estimation of a cross-spectrum matrix of a vertical array received signal in the sea. Background technique [0002] The underwater acoustic system applied in the ocean often uses a multi-element vertical hydrophone array (hereinafter referred to as the vertical array) to detect the signal of the target sound source. When the underwater acoustic system performs signal processing, the underwater acoustic signals received by each array element in the vertical array are usually first constructed into a signal cross-spectrum matrix, and further signal processing is carried out according to the cross-spectrum matrix. In order to suppress the noise in the received signal, it is necessary to adopt a certain noise suppression method when estimating the signal cross-spectrum matrix. [0003] Figure 1 shows the working...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/02H04R1/44G10L21/0232
Inventor 宫在晓张仁和黄晓砥
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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