基于GSFrFT的STLFMCW信号参数估计  

Parameter Estimation of STLFMCW Signals Based on GSFrFT

作　　者：唐江[1,2] 赵拥军[1] 朱健东[1] 

机构地区：[1]解放军信息工程大学 [2]解放军73638部队

出　　处：《电子信息对抗技术》2012年第6期11-15,20,共6页Electronic Information Warfare Technology

摘　　要：结合低截获概率雷达中常用的对称三角线性调频连续波信号(STLFMCW)的特点,提出了基于高斯短时分数阶傅里叶变换(GSFrFT)的STLFMCW信号参数估计算法。该算法首先在分数阶域二维时频面内搜索最佳旋转角,确定FrFT阶数,接着做信号的GSFrFT,然后在分数阶域表示出信号的时频关系,最后通过高斯窗长的调整实现信号参数的有效估计。仿真结果表明,该算法能在较低信噪比下精确估计信号参数。Combined with the characteristic of symmetrical triangular linear frequency modulation continuous wave（STLFMCW） signal used widely in low probability of intercept radar,a novel algorithm based on Gauss Short-Time Fractional Fourier Transform（GSFrFT） is presented for the parameter estimation of STLFMCW signal.Firstly,searching in two-dimensional time-frequency plane in fractional domain to get optimal rotating angular,the order of the fractional Fourier transform is confirmed.Then,GSFrFT is presented of the signal for setting out the relation between time and frequency in fractional domain.Finally,the parameters of STLFMCW is estimated by choosing appropriate width of Gauss window.Simulation results show that all parameters of the STLFMCW can be evaluated precisely at low SNR.

关 键 词：对称三角线性调频连续波 高斯短时分数阶傅里叶变换 参数估计 

分 类 号：TN971.1[电子电信—信号与信息处理]