摘要
通过对逆合成孔径雷达回波相邻包络和的峰度图进行分析,得到回波包络峰度图的一致性分布规律。然后依据分级快速搜索算法,结合大小步长对峰度图进行分级搜索,得到峰度最大位置所对应的回波移位比特数,将待对齐回波进行相应循环移位,实现回波包络的快速对齐。从实测数据结果可以看出,基于峰度最大准则的快速包络对齐方法与原始算法相比较,运算速率上有很大提高,并且包络对齐结果没有差别。文章同时对搜索时大步长的选取进行了讨论,得到了准最优的大步长值。
By analyzing the kurtosis chart of adjacent envelope sum of ISAR echo, the compatibility of the kurtosis chart is revealed. Then, graduation search is executed on the kurtosis chart by different step lengthes to find out the location of maximal kurtosis and the bits to be shifted. The echo is conducted circular shift and the range alignment can be completed apace. The results of actual data show that the fast range alignment algorithm works much more rapidly than the original algorithm, and the effects of the two algorithm have no difference. In this paper, how to select the big step length of the graduation search is discussed, and a nearly-best big step length value is given.
出处
《雷达科学与技术》
2007年第6期460-464,共5页
Radar Science and Technology
基金
新世纪优秀人才支持计划
国防科技重点实验室基金
