| 基于移动最小二乘曲线拟合的LFM信号参数估计 |
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| 引用本文： | 齐林,张芳,陈恩庆.基于移动最小二乘曲线拟合的LFM信号参数估计[J].郑州大学学报(工学版),2011(3). |
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| 作者姓名： | 齐林 张芳 陈恩庆 |
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| 作者单位： | 郑州大学信息工程学院; |
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| 基金项目： | 国家自然科学基金资助项目(61071211); 河南省自然科学研究计划资助项目(2009A510012) |
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| 摘 要： | 针对二维搜索方法实现基于分数阶傅里叶变换(FrFT)的线性调频信号(LFM)参数估计中存在的峰值估计偏差问题,提出可利用移动最小二乘(MLS)技术来拟合FrFT模函数峰值检测向量的方法以提高参数估计性能.该算法将复杂的二维搜索问题简化至一维曲线拟合来进行处理.理论分析与仿真结果表明,该方法在保留分数阶域处理优点的同时,可明显减少运算量,并达到较高估计精度,为基于FrFT的LFM信号实时检测提供了可能.
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| 关 键 词： | 分数阶傅里叶变换(FrFT) 移动最小二乘(MLS) 线性调频信号(LFM) |
Parameter Estimation of LFM Signal Via MLS Approximation |
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| QI Lin,ZHANG Fang,CHEN En-qing.Parameter Estimation of LFM Signal Via MLS Approximation[J].Journal of Zhengzhou University: Eng Sci,2011(3). |
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| Authors: | QI Lin ZHANG Fang CHEN En-qing |
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| Affiliation: | QI Lin,ZHANG Fang,CHEN En-qing(School of Information Engineering,Zhengzhou University,Zhengzhou 450001,China) |
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| Abstract: | To solve the problem of peak deviation estimate in the parameter estimation of Linear Frequency Modulated(LFM) signal based on the Fractional Fourier Transform(FrFT) with the method of two-dimensional searchr,an algorithm is proposed to approximate the projection of discrete FrFT modular detector with various orders by using moving least-squares(MLS) curve fitting method and precisely estimate the value of curve peak.Using this method,the complex two-dimensional peak searching can be simplified to a problem... |
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| Keywords: | fractional fourier transform moving least square method LFM |
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