一种改进的线性调频步进信号目标抽取算法

Improved Target Extraction Algorithm for Linear Modulated Stepped Frequency Signal

针对线性调频步进信号一维成像算法中的目标抽取问题,提出一种改进的目标抽取算法.在保证目标最强散射点被抽取到的前提下,该算法对最强散射点所在采样点的抽取区所有可能的位置进行遍历,根据每个可能的位置反推出一个抽取起始点,获取多组目标一维高分辨距离像(HRRP),并对各HRRP进行散射点提取,最终选择各强散射点能量累加值最大的那组HRRP作为目标的HRRP.经实测数据验证,该方法抽取效果优于逆向舍弃法.

An improved target extraction algorithm was presented for the target extraction problem of linear modulated stepped frequency signal one-dimension imaging. Based on the idea that the maximum peak of the target echo may lie in any position of the extraction range of its low range resolution cell, several high resolution range profiles （HRRP） were extracted. By extracting the scatters of the target in each HRRP, one can accumulate the energy of all the scatters. The HRRP in which the scatters of the target have the most energy will be chosen as the HRRP of the target. The validity of this method is proved by processing field measured data. It is shown that the performance is better than inverse discard method.