A broadband coherent mode-based signal processing method and system

A signal processing and modulo-based technology, used in directional multi-channel systems, radio wave measurement systems, and sound wave re-radiation, etc. Minimum detectable signal-to-noise ratio, the effect of improving detection performance

Inactive Publication Date: 2016-02-03
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

However, when this method has a low signal-to-noise ratio, the effect of normalization is significantly worse, so that the influence of the sound source cannot be eliminated.

Method used

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  • A broadband coherent mode-based signal processing method and system
  • A broadband coherent mode-based signal processing method and system
  • A broadband coherent mode-based signal processing method and system

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Embodiment

[0141] The specific implementation manner of the present invention will be further described in detail below in combination with data simulation and accompanying drawings.

[0142] Simulation conditions: The 10-element array is located on the seabed, the array element spacing is 5m, a typical shallow sea waveguide environment is taken, the sea depth is 30m, the sound velocity gradient is equal, the sound source frequency band is 400-600Hz, and 5 frequency points are taken. When the conventional processing method and the MVDR processing method are used respectively, the peak / background ratio of the broadband non-coherent processing method (inc), the broadband coherent processing method (MP), and the improved broadband coherent processing method (MP-beam) varies with different input SNR change curve, such as Figure 4-Figure 5 shown.

[0143] It can be seen that the advantages of the present invention are more obvious as the signal-to-noise ratio decreases. The processing resu...

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Abstract

The invention brings forward a broadband coherent mold base signal processing method and system. The method comprises the steps of 101) obtaining array reception data of B frequency points, performing wave beam normalization of data of full frequency bands and conducting in a coherent way to form a comprehensive reception data vector; 102) obtaining modeling vectors of the B frequency points and performing coherence of the modeling vectors of the full frequency bands to form s comprehensive expected guiding vector; 103) obtaining an optimum guiding vector based on the comprehensive reception data vector and the comprehensive expected guiding vector; and 104) obtaining a final target positioning result based on the optimum guiding vector. The step 102) includes traversing possible positions for appearance of sound sources, inputting a modeling tool to obtain weight vectors of the B frequency points and iterating the B weight vectors to finally obtain the comprehensive expected guiding vector. The step 103) includes processing the comprehensive reception data vector and the comprehensive expected guiding vector in a correlative manner and traversing all possible sound source positions to obtain a decision function, wherein the position of the maximum value of the decision function is the position of sound sources.

Description

technical field [0001] The invention belongs to the field of sonar digital signal processing, in particular to a wideband coherent mode-based signal processing method. Background technique [0002] In the sonar system, according to the different working principles, it is divided into active sonar and passive sonar. Passive sonar itself does not emit acoustic signals, but passively accepts the radiation noise of suspicious targets for target detection, and then locates and identifies the target sound source. [0003] Passive sonar sound source localization requires information such as space and bandwidth to obtain lower side lobes, and improve the robustness to environmental mismatch and the ability to suppress noise. The frequency of the ocean propagation channel varies, and the fading and time-dispersion characteristics of the channel are essentially caused by the frequency dependence of the geoacoustic properties of the ocean environment. For fixed sea areas, using singl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/06G01S7/52
CPCG01S3/8006G01S5/20
Inventor 巩玉振
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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