摘要
空间目标的高速运动会使得一维距离像产生畸变,因此高速运动补偿是空间目标高分辨雷达成像的关键步骤。基于线性调频信号模型,研究了高速运动对一维距离像产生的畸变影响,并通过定义一维距离像熵函数,将黄金分割优化搜索理论引入本文,提出一种实用高效的高速运动补偿方法,并将该方法移植到雷达信号处理机上,对大量实测高分辨雷达空间目标数据进行了处理。结果表明本文方法有效地补偿了高速运动对空间目标高分辨成像的影响,使得空间目标高分辨成像质量有了较大提高;且该方法计算量不大,满足实时ISAR成像的要求。
The high velocity of space targets will lead to aberration of range profile,so the correct compensation of high velocity is the key step for high resolution radar imaging.Based on Linear-Frequency-Modulated signal model,it studies the aberration impact of high velocity on profile of space targets.Then,a practical and effective method is put forward through defining profile-entropy function,which imports the gold-cut optimal searching theory to find out the true velocity and acceleration.Furthermore,this method has been realized on radar signal processor.With this platform large quantity of real-measured data of space targets has been processed and the results show that the above method can effectively compensate the influence of high velocity to high resolution imaging of space tarets,which improves the quality of high resolution imaging much better.What＇s more the computation of this method costs less time,which satisfies the requirement of real-time ISAR imaging.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2010年第4期1118-1124,共7页
Journal of Astronautics
基金
国防科技重点实验室基金(9140C800103070C80)
