交叉相关ISAR快速包络对齐方法

摘要

Motion compensation is the first step of ISAR imaging,while envelope alignment is the first step of motion compensation,thus envelope alignment is the key point for the following procedures,such as Doppler tracking,cross-range scaling.Existing envelope alignment algorithms are mostly based on the correlation between adjacent envelopes which are liable for drift error,accumulation error and jump error.Analyzing the sources of the error,the cross-correlation technique is propased to solve the problem.Simulation results show that the new method is simple and effective with small amount of computation.%逆合成孔径雷达成像(ISAR)的第1步是运动补偿,而包络对齐是运动补偿的第一步,决定了ISAR系统相位补偿,方位向定标等后续处理的精度,因此对于运动补偿非常关键.现有的包络对齐方法,大都基于相邻包络的相关法,容易产生漂移误差,突跳误差和积累误差,影响包络对齐的精度.分析了这3种误差出现的原因,提出了采用交叉相关的包络对齐方法,该方法在不增加运算量的情况下,消除了这3种误差,仿真实验证明了该方法简单有效适合工程应用.