| LFM信号参数估计的最大似然改进算法 |
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| 引用本文： | 牛萌,李钊,朱晓光,李建军. LFM信号参数估计的最大似然改进算法[J]. 无线电通信技术, 2009, 35(3): 59-61 |
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| 作者姓名： | 牛萌 李钊 朱晓光 李建军 |
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| 作者单位： | 1. 第二炮兵青州士官学校,山东,青州,262500
2. 第二炮兵驻石家庄地区军事代表室,河北,石家庄,050081 |
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| 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。
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| 关 键 词： | 线性调频 解线调 最大似然估计 谱估计 |
Improved Maximum Likelihood Estimation Algorithm to Estimate Parameters of LFM Signal |
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| NIU Meng,LI Zhao,ZHU Xiao-guang,LI Jian-jun. Improved Maximum Likelihood Estimation Algorithm to Estimate Parameters of LFM Signal[J]. Radio Communications Technology, 2009, 35(3): 59-61 |
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| Authors: | NIU Meng LI Zhao ZHU Xiao-guang LI Jian-jun |
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| Affiliation: | NIU Meng, LI Zhao, ZHU Xiao-guang, LI Jian-jun ( 1. The Second Artillery Sergeant School, Qingzhou Shandong 262500, China ; 2. The Military Representative Office in Shijiazhuang, Shijiazhuang Hebei 050081, China) |
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| Abstract: | 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. |
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| Keywords: | LFM dechirp maximum likelihood estimation （MLE） spectrum estimation |
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