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Amplitude-weighting-based target detection method and equipment

A detection method and technology of detection equipment, which are applied to measurement devices, re-radiation of sound waves, radio wave measurement systems, etc., can solve problems such as the inability to meet the needs of underwater remote target detection, and achieve the effects of improved detection performance and good tolerance

Inactive Publication Date: 2013-04-24
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

The signal detection method based on broadband energy integration can no longer meet the detection requirements of underwater remote targets in passive sonar detection

Method used

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  • Amplitude-weighting-based target detection method and equipment
  • Amplitude-weighting-based target detection method and equipment
  • Amplitude-weighting-based target detection method and equipment

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Embodiment Construction

[0028] Specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] Studies have shown that the rotation of the propeller of the underwater target will cut the water body to generate low-frequency signals, part of which will directly appear in the target radiation signal in an additive form, and part of the signal will be modulated to a higher frequency band by the vibration of the hull itself. In the target radiation signal, the line spectrum level is usually 10-25dB higher than the continuous spectrum level, which provides a possibility for the long-range detection of underwater targets. The invention adopts a detection method based on amplitude weighting to realize the detection of unknown underwater targets.

[0030] figure 1 is a schematic diagram of the target detection method according to the present invention.

[0031] Such as figure 1 As shown, first, use the receiving line array to ...

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Abstract

The invention provides a detection method and equipment for an underwater target. The detection method includes the steps: receiving received signal of each array element in a towed line array, conducting fast Fourier transform analysis to received signal of each array element, and acquiring spatial spectrum of each frequency unit, taking a maximum amplitude value of spatial spectrum of the each frequency unit; by means of the maximum amplitude value, conducting amplitude value weighting to spatial spectrum of the each frequency unit; and finally conducting accumulation for a sum to the spatial spectrum of the each frequency unit post-weighting. When the target radiating line spectrum signal is weak, compared with the untreated by amplitude value weighting, the detection property of the amplitude-weighting-based target detection method can be effectively improved.

Description

technical field [0001] The invention relates to the field of sonar signal processing, in particular to an underwater target detection method. Background technique [0002] Because active sonar is easy to expose, passive sonar is often used to detect underwater targets. With the continuous improvement of vibration reduction and noise reduction technology, the target radiation noise is continuously reduced compared with the environmental noise, resulting in the continuous reduction of the prior knowledge that sonar equipment can provide for its received signals. The signal detection method based on broadband energy integration can no longer meet the detection requirements of underwater remote targets in passive sonar detection. Contents of the invention [0003] The object of the present invention is to propose an underwater target detection method and equipment that can further improve the detection level. [0004] In the first aspect, the present invention provides a met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52G01S15/06
Inventor 郑恩明陈新华孙长瑜戴文舒
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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