基于ALPFT参数估计的运动目标高分辨率成像  

High resolution imaging of moving targets based on ALPFT parameter estimation

作　　者：贺靖 谭鸽伟[1] HE Jing;TAN Gewei(College of Information Science and Engineering,Huaqiao University,Xiamen 361021,China)

机构地区：[1]华侨大学信息科学与工程学院,厦门361021

出　　处：《航空学报》2025年第1期253-267,共15页Acta Aeronautica et Astronautica Sinica

基　　金：华侨大学人才项目(10BS312)。

摘　　要：针对调频连续波合成孔径雷达(FMCW SAR)对地面恒加速运动目标的运动参数估计及高分辨率成像问题展开研究。首先,建立FMCW SAR系统下的运动目标回波模型,提出自适应局部多项式傅里叶变换(ALPFT)对高达四阶的多普勒相位进行估计。其次,通过广义Keystone变换和Hough变换对距离徙动项进行校正,同时完成运动目标的速度信息估计。最后,通过补偿高阶多普勒相位以及方位重采样操作,实现对非中心目标的剩余空变相位的补偿,使场景中所有运动目标聚焦效果良好。仿真结果验证了所提方法的可行性和有效性。In this paper,the problem of parameter estimation and imaging of ground moving targets with constant ac⁃celeration for Frequency Modulated Continuous Wave Synthetic Aperture Radar(FMCW SAR)is studied.Firstly,the echo model of moving targets in the FMCW SAR system is established,and the Adaptive Local Polynomial Fourier Transform(ALPFT)is proposed to estimate the Doppler phase of echoes up to the fourth order.Secondly,the range migration terms are corrected by generalized Keystone transform and Hough transform,and the velocity information of moving targets is estimated at the same time.Finally,by compensating for the high-order Doppler phases and per⁃forming the azimuth resampling of non-central moving targets,all moving objects in the scene can be focused well.Simulation results verify the feasibility and effectiveness of the proposed method.

关 键 词：调频连续波合成孔径雷达 恒加速运动目标参数估计 自适应局部多项式傅里叶变换 广义Keystone变换 HOUGH变换 方位重采样 

分 类 号：V243.2[航空宇航科学与技术—飞行器设计]