基于改进ICPF的多分量LFM信号参数估计

Parameter Estimation of Linear Frequency Modulated Signal Based on Improved ICPF

针对线性调频信号参数估计中搜索匹配过程带来的计算量问题,提出一种基于改进ICPF的多分量线性调频信号参数估计方法。给出了一种基于非均匀快速傅立叶变换的ICPF改进算法,利用改进的ICPF算法估计线性调频信号的调频率,利用解线频调方法估计中心频率和幅度。方法避免了参数估计过程中的搜索匹配过程,计算复杂度低,在低信噪比条件下具有较好的估计性能。仿真结果验证了方法的有效性。

Considering the computational complexity in parameter estimation of Linear Frequency Modulated（ LFM） signal due to the matching process of searching,a novel method based on the improved ICPF method is proposed to estimate parameters of multi- component LFM signal. Firstly,the improved integrated cubic phase function（ ICPF） based on the nonuniform fast Fourier transform（ NUFFT） is introduced.Then,the improved ICPF is utilized to finish the chirp rate estimation of multi-component LFM signal. Finally,the dechirp method is used to estimate the centroid frequency and the amplitude. The method has low computational complexity due to avoiding the matching process of searching and still has better estimation performance in the low Signal- to- Noise Ratio（ SNR） condition. Simulations verify the effectiveness of the method.