一种搜索LFM信号模糊函数主脊切面的快速算法  

A fast algorithm for extracting main ridge slice of ambiguity function of LFM signal

作　　者：龙良将[1] 张葛祥[2] 田波[1] 王庆[2] 

机构地区：[1]西南交通大学信息科学与技术学院,四川成都610031 [2]西南交通大学电气工程学院,四川成都610031

出　　处：《重庆邮电大学学报（自然科学版）》2010年第1期33-36,共4页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60702026);四川省青年科技基金资助项目(09ZQ026-040)

摘　　要：模糊函数主脊切面特征能较好地反映不同信号波形结构上的差异,但搜索信号模糊函数主脊切面的计算量非常大。提出了一种快速搜索线性调频(linear-frequency modulated,LFM)辐射源信号主脊切面的方法。该方法利用LFM信号的分数傅立叶变换模函数具有对称性,且单边单调的性质,采用先全局后局部方式搜索LFM信号主脊切面。实验结果表明,在不降低参数估计精度的条件下,该方法的计算量大大减少。The main ridge slice feature of ambiguity function can well reflect the structural differences between signal waveforms, but it requires huge computational complexity. Hence, this paper proposes a fast approach for searching the main ridge slice of linear-frequency modulated （LFM） radar emitter signals. Considering that the modular function of fractional Fourier transform of LFM signal is symmetrical, unilateral and strictly monotone, this method employs global-first-local-sec- ond search algorithm to obtain the main ridge slice of LFM signals. Experimental results show that the computational amount reduces enormously without lowering the precision of parameters.

关 键 词：雷达辐射源 特征提取 主脊切面 迭代 

分 类 号：TN911[电子电信—通信与信息系统]