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Method and device for detecting moving object on ground by using airborne passive radar, and electronic equipment

A ground moving target, passive radar technology, applied in the field of radar detection, can solve the problems of poor airborne passive radar clutter suppression method and other problems

Active Publication Date: 2019-04-02
AIR FORCE UNIV PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the object of the present invention is to provide a kind of airborne passive radar ground moving target detection method, device and electronic equipment, to solve the less effective technology of the airborne passive radar clutter suppression method existing in the prior art question

Method used

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  • Method and device for detecting moving object on ground by using airborne passive radar, and electronic equipment
  • Method and device for detecting moving object on ground by using airborne passive radar, and electronic equipment

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Embodiment 1

[0039] Embodiments of the present invention provide an airborne passive radar ground moving target detection method, such as figure 1 As shown, the method includes:

[0040] Step S102, preprocessing the airborne passive radar signal to obtain a range compression gate.

[0041] It should be noted that, in the present invention, the airborne passive radar signal may be a digital communication signal or a digital broadcast signal, wherein the digital broadcast signal includes a digital TV signal, and the present invention uses a digital TV signal as an example for illustration.

[0042] Specifically, the preprocessing mainly includes: direct wave suppression, signal division, distance compression, etc. Among them, the airborne passive radar range gate to be measured includes: direct wave component, clutter component, target component and noise component, but only the target component has the required information, so it is necessary to extract the target component from various co...

Embodiment 2

[0055] An airborne passive radar ground moving target detection method provided in an embodiment of the present invention, such as figure 2 As shown, the method includes:

[0056] Step S202, receiving digital TV signals through a uniform linear array (uniformlylinear array, referred to as ULA) composed of a reference antenna and a plurality of early warning antennas, respectively obtaining a reference channel signal and an early warning channel signal, wherein the reference channel signal includes: direct wave components and noise Component; early warning channel signal includes: direct wave component, clutter component, target component and noise component.

[0057] image 3 It is the schematic diagram of the geometric structure of the airborne passive ULA radar. This figure takes the digital television signal as the airborne passive radar of the emission source. The flying height is H and the speed is V. In the present invention, the number of reference antennas is set to ...

Embodiment 3

[0126] An embodiment of the present invention provides an airborne passive radar ground moving target detection device, such as Figure 12 As shown, the device includes: a preprocessing module 121 , an acquisition module 122 , an establishment module 123 , a calculation module 124 and an elimination module 125 .

[0127] It should be noted that the preprocessing module 121 is used for preprocessing the airborne passive radar signal to obtain the range gate. Further, the preprocessing module 121 includes: a receiving unit, configured to receive passive signals through a reference antenna and a plurality of early warning antennas, and respectively obtain a reference channel signal and an early warning channel signal, wherein the reference channel signal includes: a direct wave component and a noise component The early warning channel signal includes: a direct wave component, a clutter component, a target component and a noise component; the filtering unit is used to filter out t...

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Abstract

The invention provides a method and a device for detecting a moving object on the ground by using airborne passive radar, and electronic equipment. The method comprises the following steps of: pre-processing airborne passive radar signals to obtain a distance compression gate; acquiring training samples according to the distance gate; establishing a joint sparse matrix recovery model based on clutter sparsity according to the training samples; calculating the joint sparse matrix recovery model by using a preset algorithm to obtain a clutter space-time spectrum; and eliminating the clutter component and the noise component in the distance gate to obtain target components by using the clutter space-time spectrum. Input parameters of the preset algorithm comprise a training sample matrix, a time domain sparse dictionary, a spatial sparse dictionary, and a preset maximum number of iterations. According to the method and the device for detecting the moving object on the ground by using theairborne passive radar, and the electronic equipment, the technical problem of poor performance of the existing airborne passive radar clutter suppression method is solved. The method can effectivelysuppress the strong clutter and the noise to obtain the target components.

Description

technical field [0001] The invention relates to the technical field of radar detection, in particular to an airborne passive radar ground moving target detection method, device and electronic equipment. Background technique [0002] Compared with active radar, passive radar does not need a source, and can use existing communication, navigation and broadcast signals for target detection. At present, the research on ground-based passive radar has matured. Compared with ground-based passive radar, the multipath interference in airborne passive radar is reduced, and a purer reference signal can be obtained, resulting in higher-quality range compression results. However, the relative motion of the carrier aircraft causes ground stationary targets (so-called clutter) to have a non-zero Doppler frequency. Doppler-broadened clutter will cover up slow-moving targets in both the Doppler frequency domain and the spatial frequency domain, making the traditional one-dimensional Doppler ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88G01S7/36
CPCG01S7/36G01S13/88
Inventor 冯为可郭艺夺张永顺何兴宇
Owner AIR FORCE UNIV PLA
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