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Method for detecting and locating weak signals of 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 improved signal-to-noise ratio and high detection probability

Active Publication Date: 2019-12-31
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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  • Method for detecting and locating weak signals of static radiation source target

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

[0039] The present invention utilizes matlab to verify the above-mentioned detection and positioning algorithm scheme; assume that the master station, slave station and target are all in a two-dimensional plane; the master station and slave station self-positioning errors are not included; all measurement errors are assumed to be Gaussian distribution assumptions The target is stationary or moving at an extremely slow speed.

[0040] Suppose there are two emitter reconnaissance stations located at q 1 =[0,0] T and q 2 =[100,0] T , the target is located at u=[150,150] T , the target area is 200km×200km, and the distance between the grid points is 1km; single-array dual-station (without digital beamforming method) and multi-array dual-station (assuming 8 arrays) are used to detect and locate a single target respectively, where image 3 is the correlation spectrum of the target...

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Abstract

The invention, which belongs to the technical field of target detection, particularly relates to a method for detecting and locating weak signals of a static radiation source target. The invention provides a method capable of remarkably improving the static target signal detection probability. The method comprises the following steps: dividing search grid points in an area in which a signal sourcemay exist and calculating time delays and azimuth angles of the grid points and all radars; according to azimuth angle information, acquiring a synthetic signal, received by each passive radar, of asignal source located on a grid point by using a digital beam forming technology; acquiring the cross-correlation spectrum peaks of the synthetic signals of the signal sources of all receivers according to the time delay information; and then whether all signal sources are real signal sources or not is determined by using constant false alarm detection method and geographical position informationof the real signal sources is obtained at the same time.

Description

technical field [0001] The invention belongs to the technical field of target detection, and in particular relates to a method for detecting and locating weak signals of static radiation source targets. Background technique [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 az...

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Application Information

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Patent Type & Authority Applications(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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