Bi-static synthetic aperture radar moving target location method

Abstract

The invention discloses a bi-static synthetic aperture radar moving target location method. The method comprises the following steps: S1) establishing an airborne BiSAR space geometry structure, and finishing parameter initialization; S2) establishing a mathematical model for moving target echo in a BiSAR imaging area; S3) obtaining a moving target equivalent radial velocity expression; S4) establishing a reception dual-channel echo in track direction; S5) carrying out phase compensation on the dual-channel echo; S6) carrying out interference processing on the dual-channel echo signals; S7) obtaining a moving target location equation through a gradient analytical method; and S8) solving the target location equation through a genetic algorithm to obtain the position of a moving target. By constructing receiver double channels, equivalent radial velocity of the moving target with respect to a receiver is obtained through the echo interference processing; the moving target positioning formula is deduced through an R-D location model; and the moving target positioning formula is calculated based on the genetic algorithm, so that the moving target can be positioned, and positioning deviation is small.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to a bistatic synthetic aperture radar (BiSAR) moving target positioning method. Background technique [0002] Compared with the traditional monostatic SAR, Bistatic Synthetic Aperture Radar (BiSAR) has various advantages such as long range and strong anti-interference ability. Therefore, various applied researches based on BiSAR are becoming more and more extensive, including the target positioning technology based on BiSAR. Object location technology plays an extremely important role in object recognition, mapping, and natural disaster monitoring. [0003] The existing BiSAR target localization algorithm is only applicable to the static situation of the target. Compared with the static target echo, the moving target echo has additional radial velocity between the radar platform and the target, which will cause problems such as image defocus and positioning deviat...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem that the traditional positioning method has positioning deviation for the moving target and cannot complete the positioning, and provides a method that obtains the equivalent radial direction of the moving target relative to the receiver by constructing dual channels of the receiver and through echo interference processing. Speed, combined with the R-D positioning model to derive the moving target positioning formula, and combined with the genetic algorithm to solve the moving target positioning formula to obtain the position information of the moving target, which can locate the moving target and has a small positioning error. Bistatic synthetic aperture radar Moving target positioning method

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