低信噪比下LFMCW信号的参数估计  

Parameter Estimation of LFMCW Signal at Low SNR

作　　者：刘勇[1] 张国毅[1] 张旭洲[1] 

机构地区：[1]空军航空大学信息对抗系,长春130022

出　　处：《电子信息对抗技术》2014年第6期28-33,共6页Electronic Information Warfare Technology

摘　　要：针对线性调频连续波(LFMCW)雷达信号特征参数提取的问题,提出了一种参数估计的方法。首先根据信号自相关函数的特点,进行峰值距离的平均,实现了调制周期的估计。然后通过解线调法得到信号的调频斜率,再通过共轭匹配法进行起始时间的搜索,得到信号的起始频率。与其他方法相比,该算法在减少计算量的同时,具有较强的抗噪性。仿真结果验证了该算法可以在低信噪比(SNR)下对LFMCW进行参数估计,具有很好的参数估计性能。To extract feature parameters of the radar signal of linear frequency modulation contin-uous wave （LFMCW）, a parameter estimation method is proposed. Firstly, according to the characteristics of the autocorrelation function, the average distance of peaks is estimated to a-chieve the modulated period. Then, the chirp rate of the signal is received by dechirp. Finally, the initial frequency of the signal is estimated by searching the initial time using conjugate match. Compared with other methods, this algorithm can not only reduce the amount of compu-tation, but also improve the ability of immunity to noise. The results of simulation verify that the proposed algorithm has a good performance of parameter estimation for LFMCW at low signal-to-noise ratio （ SNR） .

关 键 词：线性调频连续波 自相关函数 解线调 共轭匹配 

分 类 号：TN971.1[电子电信—信号与信息处理]