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Positioning method based on video SAR shadow

A positioning method and shadow technology, applied in the direction of radio wave reflection/re-radiation, instruments, measuring devices, etc., can solve the problems of poor positioning accuracy and positioning reference point error, and achieve the effect of reducing errors and speeding up positioning

Active Publication Date: 2021-06-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] In the video SAR imaging is two-dimensional information, only two reference points are needed to complete the conversion of the relative coordinates of the imaging results of the moving target into absolute coordinates, and the positioning of the moving target can be completed, but the positioning reference in the video SAR Points have errors in imaging, and there are many coherent speckle noises in video SAR imaging, and the positioning accuracy in the actual positioning algorithm is poor only based on two reference points

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  • Positioning method based on video SAR shadow
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  • Positioning method based on video SAR shadow

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Embodiment Construction

[0047] The present invention will be described in detail below in conjunction with the accompanying drawings and simulation examples to prove the practicability of the present invention.

[0048] Simulation environment: Intel i7-6700 processor, win operating system, matlab software simulation;

[0049] Dataset: Video SAR imaging video data from the Radar and Microwave Laboratory, University of Electronic Science and Technology of China.

[0050] Adopt the method of the present invention to carry out simulation analysis in matlab, utilize the simulation accuracy of different reference points in different frames as accompanying drawing 3, wherein error ε i defined as:

[0051]

[0052] It can be seen that the video SAR moving target tracking and positioning accuracy of the present invention has a very good effect of improving.

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Abstract

The invention belongs to the technical field of video SAR moving target tracking and positioning, and particularly relates to a positioning method based on a video SAR shadow. The method comprises the following steps: firstly, acquiring the absolute coordinates of a reference point in a video SAR imaging area and detecting the imaging result of the reference point to obtain the relative coordinates and absolute coordinates of the reference point and the relative coordinates of a target, then establishing an overdetermined equation set, simplifying the equation set, merging common unknown parameters into a new variable; and finally, using a least square method to complete the estimation of target parameters. According to the algorithm, an equation set is ingeniously used for solving the consensus of quadratic parameters, a quadratic equation set is replaced by a linear equation set, and the moving target estimation error is effectively reduced by using the parameter estimation advantage of the least square method.

Description

technical field [0001] The invention belongs to the technical field of video SAR moving target tracking and positioning, and in particular relates to a positioning method based on video SAR shadows. Background technique [0002] Moving target detection and analysis is always the key and hot spot in the research field of Synthetic Aperture Radar (SAR). The Sandia Laboratory of the United States proposed the VideoSAR imaging mode in 2003. Through high frame rate and high resolution imaging of the scene, dynamic observation of the ground can be realized, and relevant information of the target area can be grasped in real time. With the increasing level of enemy reconnaissance and precise guidance in the modern military, the requirements for target detection and identification as well as moving target detection, tracking, and positioning are also higher. The imaging frame rate of SAR is increasing with the development of radar technology And the improvement of computing hardware...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9021
Inventor 杨晓波李晋闵锐皮亦鸣余正顺曹宗杰崔宗勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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