基于分数阶傅里叶变换的多分量线性调频信号检测和参数估计的快速自适应方法  

Fast Adaptive Method of the Multi-LFM Signal Detection and Parameter Estimation Based on Fractional Fourier Transform

作　　者：史文国[1] 徐向辉[1] 

机构地区：[1]中国科学院电子学研究所,北京100190

出　　处：《科学技术与工程》2012年第7期1517-1521,共5页Science Technology and Engineering

摘　　要：提出了两种基于分数阶傅里叶变换(FRFT)的多分量线性调频(LFM)信号检测和参数估计的快速自适应方法。针对分数阶变换的二维搜索问题,提出了利用单线相位法分析信号时间自相关序列频谱和调频斜率预判法两种预估方法,在不影响估算精度的前提下,大幅度降低了计算的时间复杂度,且在低信噪比的情况下也可有良好的效果。仿真结果证明了方法有效。Two fast adaptive methods of the multi-LFM signal detection and parameter estimation based on FR- FT are presented. Against FRFT＇ s two-dimensional search problem, two pre-judge ways are proposed： using single-phase method to analyze the time autocorrelation sequence＇ s spectrum and predicting the chirp rate. The computational complexity has a significant reduction without affecting the estimation accuracy of the premise and can also get good results in low SNR. Computer simulations verify the effectiveness of this method.

关 键 词：分数阶傅里叶变换 线性调频信号 参数估计 快速自适应方法 

分 类 号：TN957.51[电子电信—信号与信息处理]