| 基于FRFT的动目标检测模型与参数估计精度分析 |
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| 引用本文： | 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 |
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| 作者姓名： | 陈小龙 王国庆 关键 何友 |
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| 作者单位： | 海军航空工程学院电子信息工程系,山东烟台,264001 |
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| 基金项目： | 教育部新世纪优秀人才支持计划资助项目，国家自然科学基金，"泰山学者"建设工程专项经费资助项目 |
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| 摘 要： | 采用分数阶傅里叶变换解决微弱运动目标的检测问题。首先,根据雷达发射的不同形式信号以及目标的运动状态,分别建立动目标回波模型,它们均可表示为频率和调频率参数未知的线性调频(LFM)信号,并给出相应的参数估计方法。然后,着重分析了信号观测时长、扫描步长、采样频率和信噪比等影响参数估计精度的因素,从实际应用出发,给出了实现LFM信号高精度参数估计的方法。最后,仿真分析了各个因素对参数估计精度的影响。结果表明,增加信号观测时长的同时适当缩小扫描步长,能够有效提高参数估计精度,同时能在低信噪比(SNR=-8 dB)下具有较高的检测概率(Pd=0.9),证明了理论分析的正确性。
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| 关 键 词： | 分数阶傅里叶变换 动目标检测 参数估计 |
Analysis of Model of Moving Target Detection and Precision of Parameter Estimation Based on FRFT |
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| CHEN Xiao-long,WANG Guo-qing,GUAN Jian,HE You. Analysis of Model of Moving Target Detection and Precision of Parameter Estimation Based on FRFT[J]. Modern Radar, 2011, 33(5): 39-45 |
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| Authors: | CHEN Xiao-long WANG Guo-qing GUAN Jian HE You |
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| Affiliation: | CHEN Xiao-long,WANG Guo-qing,GUAN Jian,HE You(Department of Electronic and Information Engineering,Naval Aeronautical and Astronautical University,Yantai 264001,China) |
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| Abstract: | In 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 methods are given in accordance with different detection models,which can be approximately represented as LFM signals with unknown frequency and unknown frequency modulated rate.Then,factors related with estimation precision such as observed... |
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| Keywords: | fractional Fourier transform moving target detection parameter estimation |
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