现代雷达2011，Vol.33Issue(5)：39-45,7.
基于FRFT的动目标检测模型与参数估计精度分析
Analysis of Model of Moving Target Detection and Precision of Parameter Estimation Based on FRFT
摘要
Abstract
ln this paper, weak moving target detection is solved by fractional Fourier transform ( FRFT) method. Firstly, different detection models of moving target are set up respectively according to different types of radar transmission signal and moving states.Parameter estimation methuds are given in accordance with different detection models, which can he approximately represented as LFM signals with unknown frequency and unknown frequency modulated rate. Then, factors related with estimation precision such as observed time, search step, sampling frequency and signal-to-noise ratio ( SNR) are analyzed. Methods which can improve estimation precision are put forward in view of practical application. In the end, effects of different factors upon estimation precision are studied and simulated. Simulation results present that estimation precision can be remarkably improved with extra observed time and proper search step. Moving target can be detected in low SNR ( SNR = - 8 dB) environment with high detection probabiliiy (Pd =0. 9) , which indicates the correctness of theoretical analysis.关键词
分数阶傅里叶变换/动目标检测/参数估计Key words
fractional Founer transform/ moving target detection/ parameter estimation分类
信息技术与安全科学引用本文复制引用
陈小龙,王国庆,关键,何友..基于FRFT的动目标检测模型与参数估计精度分析[J].现代雷达,2011,33(5):39-45,7.基金项目
教育部新世纪优秀人才支持计划资助项目(NCET-05-0912) （NCET-05-0912）
国家自然科学基金资助项目(60672140,60802088)"泰山学者"建设工程专项经费资助 （60672140,60802088）
