New method for parameter estimation of LFM signal

Abstract

Abstract: A new method based on reduced dimension is proposed for parameter estimation of Linear Frequency Modulation（LFM） signal. The basic idea is to estimate center frequency by a mathematical transformation, which translates the center frequency estimation to the frequency estimation of a sinusoid wave, and then the chirp rate is estimated by using Dechirp technology and one point DFT at the corresponding center frequency. The proposed method improves estimation precision, reduces computation. The simulation shows the validity of the method.

Key words: parameter estimation, linear frequency modulation signal, Discrete Fourier Transform（DFT）, spectrum subdivision

摘要： 提出了基于降维处理的LFM信号参数估计新方法。其基本思路是对信号进行数学变换，将LFM信号的中心频率估计转换为对正弦信号频率的估计，得中心频率估计值；基于解线性调频处理并对信号进行对应中心频率处的单值点DFT得到单值幅度谱，进而得到调频斜率估计值。新方法在较低的计算复杂度下，能获得较高精度的参数估计值。计算机仿真结果表明了该方法的有效性。

关键词: 参数估计, 线性调频信号, 离散傅里叶变换（DFT）, 频谱细化

FENG Weiting, ZHANG Baojun. New method for parameter estimation of LFM signal[J]. Computer Engineering and Applications, 2014, 50(12): 216-219.

冯维婷，张宝军. 一种LFM信号参数估计的新方法[J]. 计算机工程与应用, 2014, 50(12): 216-219.

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New method for parameter estimation of LFM signal

一种LFM信号参数估计的新方法

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