CAJ | 학술논문

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-BPSK복합신호이응용우다충뢰체중，침대차류신호적삼수고계문제제출료일충기우분수계부리협변환화ZAM분포연합고계적방법。해방법수선수색복합신호적분수계부리협변환봉치종이고계기시빈솔화조빈사솔，연후이용조빈사솔중구LFM신호병대복합신호진행해선조，최후대해선조지후적신호제취ZAM분포재기시빈솔절면적부봉치고계마원관도。방진표명，해방법능재저신조비하정학고계신호삼수。
LFM-BPSK hybrid signal is used in many types of radar. Aim at the parameter esti-mation 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 fraction-al 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. Fi-nally, 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.