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目前,采用分数阶Fourier变换算法对线性调频(LFM)信号实现参数估计的研究中,总假定观测信号的时长等于LFM信号的脉冲宽度,但这一假设在实际中难以得到保证,故原有参数估计算法具有极大的应用局限性。本文通过对实际观测信号形式进行分析,推导出原有参数估计算法的估计误差,在此基础之上给出了一种新的实用的线性调频信号参数估计方法。仿真结果表明新的参数估计方法可打破原有应用局限,对实际观测信号实现有效的参数估计。
At present, the fractional Fourier transform algorithm for linear frequency modulation (LFM) signal parameter estimation study, the total assumption that the duration of the observation signal is equal to the pulse width of the LFM signal, but this assumption is difficult to be guaranteed in practice, so the original parameters Estimation algorithm has great application limitations. In this paper, by analyzing the actual observation signal form, the estimation error of the original parameter estimation algorithm is deduced, and a new parameter estimation method of LFM signal is given. The simulation results show that the new parameter estimation method can break the limitations of the original application and realize effective parameter estimation of the actual observed signal.