Method for increasing passive sonar operating distance by means of shallow sound field airspace characteristics

A technology of working distance and passive sound, which is applied in ocean engineering, sonar, and underwater acoustic engineering

Active Publication Date: 2015-07-08
NAT DEEP SEA CENT
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Problems solved by technology

However, affected by the multipath effect in the waveguide, the signal radiated by the sound source tends to split into m

Method used

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  • Method for increasing passive sonar operating distance by means of shallow sound field airspace characteristics
  • Method for increasing passive sonar operating distance by means of shallow sound field airspace characteristics
  • Method for increasing passive sonar operating distance by means of shallow sound field airspace characteristics

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Experimental program
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Embodiment

[0060] Such as figure 1 As shown, the signal data analysis

[0061] The center frequency of the sound source emission signal is 335Hz, the data sampling rate is 1kHz, the -3dB bandwidth is approximately 30Hz, and a total of about 10 minutes of data is obtained. It is worth noting that the experimental data contains both signal and noise. The array element input signal-to-noise ratio is about 10dB. Since the narrowband problem is mainly concerned, the narrowband time-domain beamforming method can be used to analyze the receiving directivity response of the vertical line array to the long-distance sound source signal. Filter the received experimental data through a FIR bandpass filter with a passband of 333-337Hz to make it a narrowband signal. The signal covariance matrix is ​​estimated by the average of 60s experimental data.

[0062] Such as figure 2 As shown in , the receiving directivity response of the sub-vertical receiving array to the long-distance sound source si...

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Abstract

The invention relates to the fields of hydroacoustic engineering, oceanographic engineering and sonar technology, in particular to a method for increasing passive sonar operating distance by means of shallow sound field airspace characteristics. The method is suitable for shallow sea target passive detection. The method comprises the steps of placing a short vertical array in a shallow water acoustic channel, establishing conventional beamformer weight vector by means of the spatial aperture of the short vertical array, acquiring the reception directional response of the short vertical array, obtaining the vertical reception directivity to noise data and a remote sound source of the short vertical array, and reasonably adjusting the directivity of the short vertical array to obtain a higher output signal to noise ration by comparing the vertical reception directivity to noise data with the vertical reception directivity to the remote sound source. According to the method, the difference between the reception directional response to ambient sea noise and the reception directional response to a remote sound source radiator signal of the vertical array in shallow sea is fully utilized, the output signal to noise ration of a received signal is increased, and then the operating distance of a passive sonar is increased.

Description

technical field [0001] The invention relates to the fields of underwater acoustic engineering, marine engineering, sonar technology, etc., and in particular relates to a method for improving the working distance of passive sonar by using the spatial characteristics of the shallow sea sound field, which is suitable for passive detection of shallow sea targets. Background technique [0002] Taking anti-submarine requirements as an example, in the second half of the last century, with the tremendous progress in submarine noise reduction and echo cancellation technology, submarine radiation noise was significantly reduced. This drastically reduces the range of action of passive sonar, even to the point where two quiet submarines do not detect each other and even collide. However, the marine environmental noise as the background noise is extremely complex, especially in shallow sea environmental conditions. In order to be able to carry out effective anti-submarine operations aga...

Claims

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Application Information

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IPC IPC(8): G01S15/88
CPCG01S15/88
Inventor 张同伟杨坤德丁忠军杨波刘烨瑶唐嘉陵
Owner NAT DEEP SEA CENT
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