Ground moving target track reconstruction method suitable for CSAR imaging

A technology of ground moving target and moving target

Active Publication Date: 2018-06-22
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, the conventional SAR-GMTI system adopts the working mode of straight-line flight, which does not have the ability to observe the moving target for a long time, and it is difficult to realize the function of reconstructing the trajectory of the moving target.

Method used

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  • Ground moving target track reconstruction method suitable for CSAR imaging
  • Ground moving target track reconstruction method suitable for CSAR imaging
  • Ground moving target track reconstruction method suitable for CSAR imaging

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Embodiment Construction

[0064] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0065] Circular motion is a special form of curved motion, which has the largest observation angle and can observe the scene for a long time. The technical solution of the present invention will be described below by taking circular motion as an example.

[0066] figure 1 It is a schematic diagram of the application scene of the present invention. In the figure, the radar platform flies along a circle, and the beam always points to the detection area to observe the moving targets in the detection area for a long time.

[0067] figure 2 It is a flowchart of the present invention. A method for reconstructing the trajectory of a ground moving target suitable for CSAR imaging, comprising the following steps:

[0068] S1. Perform range...

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Abstract

The invention provides a ground moving target track reconstruction method suitable for CSAR imaging. The method includes steps of S1, performing range compression on received CSAR moving target echo wave signals, dividing full aperture echo waves of a radar into a plurality of sub aperture echo waves, converting the sub aperture echo waves into a distance Doppler domain, realizing moving target detection through Doppler filtering and constant false alarm rate detection and acquiring a position of the moving target in an RD domain; S2, realizing moving target correlation in different sub apertures by utilizing a multi-target tracking algorithm and acquiring the movement path of the moving target in the RD domain; S3, projecting the moving target RD domain track into a road grid and realizing moving target track reconstruction by utilizing a dynamic planning algorithm. According to the invention, a CSAR mode is adopted and long-term moving target observation capability is achieved. at the same time, through increasing road prior information and utilizing dynamic planning for solving an optimization equation, target track reconstruction precision can be improved.

Description

technical field [0001] The invention belongs to the field of synthetic aperture radar (Synthetic Aperture Radar, SAR) ground moving target indication (Ground Moving Target Indication, GMTI), and relates to a ground moving target track reconstruction ( Ground Moving Target Trajectory Reconstruction, GMTTR) method. Background technique [0002] Synthetic Aperture Radar (SAR) is a radar technology that can perform high-resolution microwave imaging of observation scenes. Initially, the main function of SAR was to obtain static radar images of observation scenes. In order to improve battlefield awareness, people hope that SAR can realize the reconnaissance and detection of ground moving targets while completing the imaging reconnaissance of stationary targets, that is, it has the function of GMTI. SAR-GMTI can complete the imaging reconnaissance of stationary / moving targets at the same time, which greatly expands the application range of SAR technology. Trajectory reconstructio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 安道祥王武周智敏陈乐平冯东罗雨潇
Owner NAT UNIV OF DEFENSE TECH
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