L波段雷达电离层高速运动目标ISAR成像补偿方法  

Compensating Method of L-band Radar ISAR Imaging for Ionosphereic Target with High-velocity

作　　者：黄小红[1] 文贡坚[1] 

机构地区：[1]国防科技大学自动目标识别重点实验室,长沙410073

出　　处：《电子与信息学报》2015年第12期2971-2976,共6页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61002025)~~

摘　　要：目标高速运动和电离层效应都会对低频段宽带线性调频雷达信号的相位产生调制现象,进而降低逆合成孔径雷达(ISAR)成像分辨率。为得到清晰的目标ISAR图像,需有效消除这两者对目标回波的影响。该文首先建立电离层高速运动目标回波的信号模型,再根据目标回波为高阶多项式相位信号的特点,提出基于离散多项式变换的高阶相位估计算法,利用高阶相位估计值进行回波信号相位调制分量补偿,实现ISAR成像的自聚焦。仿真实验表明,该算法可以准确估计回波信号高阶相位参数,提高ISAR成像质量。High velocity and Ionosphereic both modulate the phase of low carrier frequency wide-band linearly frequency modulated radar signal, It make the resolution of Inverse SAR（ISAR） image lower. In order to get clean ISAR image, the effect of high velocity and ionosphereic are both must be removed. Firstly, signal model of ionosphereic target with high-velocity are deduced. The high order phase signal parameter estimation method is proposed, using discrete polynomial-phase transform. Motion compensation is done with the estimated values got by this method. Simulation experiments show that the parameters can be estimated right, it can improve the ISAR image deformed by hyper-velocity and ionosphereic.

关 键 词：逆合成孔径雷达 电离层 多项式相位信号 运动补偿 

分 类 号：TN958[电子电信—信号与信息处理]