检测调频信号的改进算法研究

An Improved Algorithm For Detecting LFM Signal

针对 LFM信号 ,提出了一种改进的 LMS算法 ,通过修正权系数 ,使之能跟上信号的调频速率 ,从而实现低信噪比 ( - 1 5d B)条件下的信号检测。文中叙述了算法的基本原理及仿真结果 ,指出了对于 LFM信号 ,修正权系数的 LMS算法比 LMS算法具有更好的提取弱信号的能力 ,并且算法运算量小。

In this paper,a new modified algorithm based on LMS is proposed by modifying the weighting factor at the far end of the line,which can follow the lineary varying frequency of the input,so that the capability to detect LFM signal can be improved even in low signal noise ratio(-15dB) condition.The basic principle of the proposed algorithm and the simulation results are described.The simulation results show that the modified LMS algorithm is satisfactory.