一种多 LFM 信号检测与参数估计的方法

摘要

针对常规方法对多个线性调频（LFM ）信号进行处理时存在运算量大、不能满足快速检测和交叉干扰的问题，分析了采用分数阶傅里叶变换（FrFT ）对LFM 信号进行参数估计的原理，基于快速解线性调频技术，将LFM 信号检测与参数估计由二维搜索转换为2个一维搜索。该方法可以有效减小运算量，易于工程实现。仿真结果表明，此方法在低信噪比下仍具有良好的性能。%Aiming at the problems that the operational quantity is large ,the rapid detection can't be realized ,and the cross-interference can't be solved w hen the multiple linear frequency modulation (LFM ) signals are processed by general methods ,this paper analyzes the theory using fraction rank Fourier transform (FrFT ) to estimate the parameters of LFM signal ,transforms the detection and parameter estimation of LFM signals from one two-dimension searching to two one-dimension searching based on fast dechirp technology .T his method can effectively decrease the calculation quantity ,and is easy to be realized .Simulation result show s that the method has good performance under the condition of low signal to noise ratio .