摘要
为解决低截获概率(low probability of intercept,LPI)雷达信号中二相相移键控(binary phase shiftkeying,BPSK)信号、线性调频(linear frequency modulation,LFM)信号参数的估计问题,提出了基于信号积分包络的快速参数估计方法。应用快速傅里叶变换(fast Fourier transform,FFT)进行雷达信号粗识别,对信号进行积分包络处理。对两类信号的积分包络值分别设置一定的门限,通过搜索BPSK信号积分包络的峰值即可迅速计算出BPSK信号的码速率。搜索LFM信号积分包络的零值点,按照给出的计算规则即可计算信号的调频斜率以及起始、终止频率。该算法具有快速、准确、容易实现的特点。仿真实验证明了该算法的有效性。同时,该算法具有一定的抗噪性。
A quick parameters estimation method based on the integral-envelope is proposed to estimate the parameters of binary phase shift keying（BPSK） and linear frequency modulation（LFM） signals in the low probability of intercept（LPI） radar.First,rough recognition to radar-signals is achieved by using fast Fourier transform（FFT）.Then,the integral-envelope is used to process signals,and a certain threshold is set to the two types of signals respectively.Finally,the code-rate of BPSK signals can be calculated quickly by searching the peaks of integral-envelope.The FM slope,initial frequency and terminal frequency can also be got according to the given rules by searching the zero-points.The algorithm has the advantages of high speed,preciseness,and the algorithm can be carried out easily.The experimental results show the effectiveness of the algorithm,at the same time,it has the stronger capability on anti-noise.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2010年第10期2031-2035,共5页
Systems Engineering and Electronics
基金
国家重点基础研究发展计划(973计划)(61393010101-1)资助课题
关键词
雷达信号
低截获概率
积分包络
参数估计
峰值点
零值点
抗噪性
radar-signal
low probability of intercept（LPI）
integral-envelope
parameter estimation
peak-point
zero-point
anti-noise capability
