Beam domain coherent azimuth estimation method and system based on fluctuated phase alignment

A technology of azimuth estimation and phase alignment, applied to radio wave measurement systems, positioning, measurement devices, etc., can solve problems such as not considering the transmission channel

Inactive Publication Date: 2014-08-06
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the existing detection method does not consider the impact of the fluctuation effect brought by the transmission chan

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  • Beam domain coherent azimuth estimation method and system based on fluctuated phase alignment
  • Beam domain coherent azimuth estimation method and system based on fluctuated phase alignment
  • Beam domain coherent azimuth estimation method and system based on fluctuated phase alignment

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Embodiment Construction

[0060] The present invention will be further described now in conjunction with accompanying drawing.

[0061] Before the method of the present invention is described in detail, a brief description of the sonar array on which the method of the present invention is based is firstly given.

[0062] Such as figure 2 As shown, the sonar array based on the method of the present invention includes M hydrophones (also referred to as primitives of the sonar array), and these hydrophones are jointly arranged into a long line array, and the distance between each hydrophone The distances are equal, and d represents the distance between the hydrophones.

[0063] refer to figure 1 , the method of the present invention comprises the following steps:

[0064] Step 1), performing cumulative division of frequency points on the received wideband array element domain signal to obtain an array element domain signal of a single frequency point.

[0065] The radiated noise signal of the surface...

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Abstract

The invention relates to a beam domain coherent azimuth estimation method based on fluctuated phase alignment. The method is implemented on the basis of a long-line sonar array formed by M equidistant hydrophones. The method includes the first step of conducting frequency point accumulative division on broadband array element domain signals received by the sonar array to obtain array element domain signals of single frequency points, the second step of obtaining direction guidance vectors of incoming wave signals of the sonar array, the third step of converting the array element domain signals of the single frequency points into a beam domain according to the obtained direction guidance vectors, the fourth step of conducting fluctuation coherent processing on the beam domain signals, and the fifth step of calculating a beam output energy power value of the beam domain signals subjected to fluctuation coherent processing and then realizing estimation of target azimuth. The beam domain coherent azimuth estimation method based on fluctuated phase alignment effectively improves the suppression effect of output gain and strong interference of the signals and has excellent spatial resolving capability.

Description

technical field [0001] The invention relates to the field of underwater acoustic signal processing, in particular to a beam domain coherent orientation estimation method and system based on fluctuation phase alignment. Background technique [0002] How to determine the orientation of the signal source is a basic problem in array signal processing, which is also one of the important tasks in many application fields such as radar and sonar. Multiple targets need to be positioned in many fields such as ocean development, precision guidance, biomedicine, geological exploration, national defense and civil construction. With the rapid development of science and technology, the requirements for target resolution and parameter estimation accuracy are also increasing. Therefore, array high-resolution target positioning technology has always been a very important research content. Many underwater target detection systems, automatic guidance systems and communication systems require a...

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Application Information

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IPC IPC(8): G01S5/18
CPCG01S5/22
Inventor 解恺丁雪洁黄海宁李启虎
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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