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A method for detecting and locating the weak signal of a static radiation source target

A weak signal detection and radiation source technology, applied in the field of target detection, can solve problems such as unavailability, lack of prior knowledge, difficult positioning of a single passive radar, and achieve the effect of high detection probability and improved signal-to-noise ratio.

Active Publication Date: 2022-08-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0002] Passive radar finds the target by receiving and detecting the electromagnetic wave signal emitted by the radiation source target. Compared with the active radar, the passive radar generally cannot know the prior information of the signal in advance, so it cannot use some of the active radar system to improve the signal-to-noise ratio. Gain method, weak signals are difficult to be detected; in addition, due to the lack of prior knowledge, a single passive radar generally can only obtain information such as the azimuth and arrival time of the signal, and it is difficult for a single passive radar to complete positioning. Although passive radar can achieve instantaneous cross positioning through the position distribution in space and the obtained azimuth angle information, it must also be able to detect the radiation source target

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  • A method for detecting and locating the weak signal of a static radiation source target
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  • A method for detecting and locating the weak signal of a static radiation source target

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[0038] The present invention is described in detail below in conjunction with specific examples:

[0039] The invention uses matlab to verify the above detection and positioning algorithm scheme; it is assumed that the master station, the slave station and the target are all in a two-dimensional plane; the positioning errors of the master station and the slave station themselves are not calculated; all measurement errors are assumed to be Gaussian distribution assumptions The target is stationary or moving very slowly.

[0040] Suppose there are two radiation source reconnaissance stations located at q 1 =[0,0] T and q 2 =[100,0] T , the target is at u=[150,150] T , the target area is 200km×200km, and the grid points are 1km away from each other; single-array dual-station (without using digital beamforming method) and multi-array dual-station (assuming 8 arrays) are used to detect and locate a single target, among which image 3 is the correlation spectrogram detected by ...

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Abstract

The invention belongs to the technical field of target detection, in particular to a method for detecting and locating weak signals of a static radiation source target. The present invention proposes a method that can significantly improve the detection probability of stationary target signals. First, divide the search grid points in the area where the signal source may exist, and calculate the time delay and azimuth angle between the grid point and each radar; digital beamforming technology can be used to obtain the received information of each passive radar located on the grid point according to the azimuth angle information. The composite signal of the "signal source", and then obtain the cross-correlation spectrum peak of the composite signal of the "signal source" of each receiver according to the time delay information. Finally, the constant false alarm detection method can be used to judge whether all the "signal sources" are real signal sources. At the same time, the geographic location information of the real signal source is obtained.

Description

technical field [0001] The invention belongs to the technical field of target detection, in particular to a method for detecting and locating weak signals of a static radiation source target. Background technique [0002] Passive radar finds the target by receiving and detecting the electromagnetic wave signal emitted by the radiation source target. Compared with active radar, passive radar generally cannot know the prior information of the signal in advance, so it is impossible to use some of the active radar systems to improve the signal-to-noise ratio. With the gain method, weak signals are difficult to detect; in addition, due to the lack of prior knowledge, a single passive radar can generally only obtain information such as the azimuth angle and time of arrival of the signal, and it is difficult for a single passive radar to complete positioning, and multiple Although passive radar can achieve instantaneous cross-location through the position distribution in space and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/14G01S5/06G01S5/04G01S5/16
CPCG01S5/14G01S5/06G01S5/04G01S5/16
Inventor 李万春郭昱宁王敏邹炜钦王丽
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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