This letter presents a fast and accurate method for parameter estimation of multi-component linear frequency modulated (MC-LFM) signals. We first show that the auto-terms of signal in fractional auto-correlation (FrAc) domain are concentrated along lines passing through the origin with slopes equal to chirp rates. The connection between the FrAc and fractional Fourier transform (FrFT) is exploited to find the chirp rates. We then easily obtain central frequencies from the same FrFT coefficients which are used for the estimation of chirp rates. We finally propose our efficient algorithm to accelerate the precise estimate of the MC-LFM signal parameters. Simulation results validate performance of the approach.

中文翻译：

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一种快速准确的多分量LFM信号参数估计方法


这封信提出了一种快速准确的多分量线性调频 (MC-LFM) 信号参数估计方法。我们首先表明，分数自相关 (FrAc) 域中信号的自项集中在通过原点的直线上，斜率等于啁啾率。利用 FrAc 和分数傅立叶变换 (FrFT) 之间的联系来查找线性调频脉冲速率。然后，我们可以轻松地从用于估计线性调频频率的相同 FrFT 系数中获得中心频率。我们最终提出了有效的算法来加速 MC-LFM 信号参数的精确估计。仿真结果验证了该方法的性能。