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Underwater acoustic target signal detection and identification method

A target signal and recognition method technology, applied in the field of underwater acoustic signal processing, can solve the problems of inability to judge and wrong judgment of detection results

Inactive Publication Date: 2010-06-16
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to propose a detection and recognition method for underwater acoustic target signals in order to overcome the situation that the detection result cannot be judged or even a wrong judgment may be made when the interference background is non-stationary

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  • Underwater acoustic target signal detection and identification method
  • Underwater acoustic target signal detection and identification method

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Embodiment Construction

[0052] The best implementation mode will be described below in conjunction with the accompanying drawings.

[0053] figure 1 It is a schematic diagram of the orientation of the linear array and the target relative to the linear array. The number of primitives in the linear array is MM, the interval between primitives is d, and the orientation of the target relative to the linear array is θ.

[0054] Figure 2-a , Figure 2-b , Figure 2-c and Figure 2-d It is an example of the processing results of the target signal and the interference background. The variance of the target signal is relatively small, which is calculated to be 0.94°, while the variance of the interference is relatively large, which is calculated to be 19.13°. The orientation of the target signal relative to the measurement array is relatively stable within the processing time However, the orientation of the strong interference background relative to the measurement array is random within the processing t...

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Abstract

The invention provides an underwater acoustic target signal detection and identification method. The method is used for detecting and identifying the signal of an unknown target frequency band under non-stationary interferences. The method specifically comprises the following steps: (1) performing frequency domain beamforming on a received signal by array; (2) performing energy integral on output sub-band obtained after the frequency domain beamforming in the step (1) to obtain beam outputs of different frequency bands; (3) respectively detecting the beam outputs of different frequency bands obtained in the step (2), if detecting signal, calculating the orientations where the target beams appear and separately recording the detection orientations of different frequency bands; (5) executing the step (5) if the processing time is more than the preset time, if not, repeating the step (1), (2) and (3); (5) performing quadratic fitting on the orientations stored in different frequency bands, and calculating the orientations and estimating variances according to the fitting result; and (6) comparing the calculated orientation estimated variances of different frequency bands with a given detection variance threshold to further judge the detection result.

Description

technical field [0001] The invention belongs to the field of underwater acoustic signal processing, in particular to an underwater acoustic target signal detection and identification method. Background technique [0002] In the application field of underwater acoustic signal processing, the unknown interference at sea is an important factor affecting the detection and identification of target sound sources, especially when the signal processing involves frequency bandwidth, because the frequency band larger than the useful signal bandwidth is processed , which is equivalent to greatly reducing the input signal-to-noise ratio, and processing the frequency band smaller than the bandwidth of the useful signal is equivalent to reducing the signal processing gain, thereby reducing the detection performance of the signal. [0003] At present, the main underwater acoustic signal processing technology is carried out for a specific frequency band, using the method of energy coherent ...

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Application Information

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IPC IPC(8): G01S7/539G01S15/88G01H3/00
Inventor 陈新华余华兵孙长瑜
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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