摘要
针对低信噪比下多相码信号参数估计方法性能不佳的问题,提出了一种低信噪比下基于积分二次相位函数(IQPF)和分数阶傅里叶变换(Fr FT)的联合参数估计方法。首先在理论上推导出IQPF将多相码信号的所有脊线累积为一个峰值,并利用IQPF估计出的调频率将Fr FT的二维搜索变为一维搜索,从而估计出其他参数。仿真实验表明,所提方法在计算量以及估计精度上优于传统方法。
Aiming at the problem of the poor performance method in estimating the polyphase code signal parameter under low signal to noise ratio（ SNR）,a joint parameter estimation method based on integral quadratic phase function（ IQPF） and fractional Fourier transform（ Fr FT） is put forward. The IQPF is proved by the formulas in theory to accumulate the polyphase code signal multiple ridge lines into one peak,and the modulated frequency rate which is estimated by IQPF is used to convert the 2 D searching of Fr FT into one dimension searching,so as to estimate the other parameters. Simulation results show that the method on the amount of calculation and estimation precision is superior to the traditional methods.
作者
刘歌
张旭洲
汪洪艳
LIU Ge;ZHANG Xu-zhou;WANG Hong-yan(Aviation University of Air Force, Department of Information Countermeasures,~ilin Changchun 130022, China)
出处
《现代防御技术》
2018年第2期114-121,185,共9页
Modern Defence Technology
关键词
雷达侦察
多相码信号
积分二次相位函数
分数阶傅里叶变换
低信噪比
参数估计
radar reconnaissance
polyphase signal
integral quadratic phase function （IQPF）
fractional Fourier transform（FrFT）
low signal to noise ratio
parameter estimation
