低信噪比下LFM-BPSK复合信号参数估计新方法  

A New Method for Parameters Estimation of LFM- BPSK Hybrid Signal in Low SNR

作　　者：胡鑫磊[1] 张国毅[1] 王春雨[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》2015年第3期16-20,24,共6页Electronic Information Warfare Technology

摘　　要：LFM-BPSK复合信号已应用于多种雷达中,针对此类信号的参数估计问题提出了一种基于分数阶傅里叶变换和ZAM分布联合估计的方法。该方法首先搜索复合信号的分数阶傅里叶变换峰值从而估计起始频率和调频斜率,然后利用调频斜率重构LFM信号并对复合信号进行解线调,最后对解线调之后的信号提取ZAM分布在起始频率截面的负峰值估计码元宽度。仿真表明,该方法能在低信噪比下精确估计信号参数。LFM- BPSK hybrid signal is used in many types of radar. Aim at the parameter estimation of this kind signal,a new joint method based on the fractional Fourier transform and ZAM distribution is put forward. Firstly,through searching the peak value of hybrid signal's fractional Fourier transform,the initial frequency and the frequency rate are estimated. Then,with the help of frequency rate,the LFM signal is reconstructed and the hybrid signal is dechirped. Finally,the code width is estimated by the negative peak value of the initial frequency's ZAM section. Simulation proves this method could accurately estimate signal 's parameters in low SNR.

关 键 词：参数估计 分数阶傅里叶变换 ZAM分布 

分 类 号：TN957.51[电子电信—信号与信息处理]