摘要
为实现含噪声LFM信号参数的快速检测和精确估计,提出了一种基于延时相关解线调的最大似然估计改进算法,即首先在时域内进行延时相关解线调,然后对解线调后含噪声信号进行经典功率谱估计,得到调频斜率的粗略估计,将此估计值作为初始值,再进行最大似然估计,得到调频斜率的精确估计值,用此精确估计值对原LFM信号进行解线调,再以同样的思路可以得到LFM信号初始频率的最大似然精确估计值。仿真实验证明了该算法的有效性。
An improved maximum likelihood estimation algorithm based on delay correlation dechirp is proposed to obtain quick detection and accurate parameter estimation of LFM signal with noise. Firstly LFM signal is dechirped by delay correlation dechirp in time domain, and secondly the parameter of the dechirped signal is estimated by the classical power spectrum estimation to obtain a rough estimation of frequency rate, which is then taken as an initial value of maximum likelihood estimation for estimating the parameter of dechirped signal to get the accurate value of frequency rate. After that, the initial LFM signal is dechirped by use of this accurate value of frequency rate, and then the accurate value of initial frequency is obtained in the same way. This algorithm is proved to be effective by the simulation experiment.
出处
《无线电通信技术》
2009年第3期59-61,共3页
Radio Communications Technology
关键词
线性调频
解线调
最大似然估计
谱估计
LFM
dechirp
maximum likelihood estimation （MLE）
spectrum estimation
