A localization method based on video sar shadow

Abstract

The invention belongs to the technical field of video SAR moving target tracking and positioning, and in particular relates to a video SAR shadow-based positioning method. The method of the present invention: first, based on the collection of the absolute coordinates of the reference point in the video SAR imaging area, and the detection of the imaging results of the reference point, the relative coordinates, the absolute coordinates and the relative coordinates of the target are obtained, and then the overdetermined equation is established. group, and simplify the equation system, combine the common unknown parameters into new variables, and turn it into an overdetermined linear equation system. Finally, the least squares method is used to complete the estimation of the target parameters. This algorithm cleverly utilizes the commonality of quadratic parameters in solving equations, replaces quadratic equations with linear equations, and uses the parameter estimation advantage of least squares to effectively reduce the error of moving target estimation.

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 video SAR shadow-based positioning method. Background technique [0002] Moving target detection and analysis has always been the key and hot spot in the research field of Synthetic Aperture Radar (SAR). The American Sandia laboratory proposed the VideoSAR imaging mode in 2003. Through the high frame rate and high resolution imaging of the scene, the dynamic observation of the ground can be realized, and the relevant information of the target area can be grasped in real time. With the increasing level of enemy reconnaissance and precision guidance in the modern military, the requirements for target detection and recognition, as well as detection, tracking and positioning of moving targets are also higher, and the imaging frame rate of SAR increases with the development of radar technology And the improvement of computing har...

AI Technical Summary

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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