基于渐进可控频偏范围的多频实信号频率估计器

Multi-frequency real signal frequency estimator based on gradually controllable frequency offset range

多频实信号的频率估计是应用面广的基础信号处理问题,其精度受限于难以降低各频率成分的谱间干扰。为根本解决该问题,提出可自动抑制谱间干扰的多频实信号频率估计器,具体以频偏范围可控的单频估计器为基础,通过迭代构造两种残差信号(即降序残差和排它残差)并将其馈入单频估计器,从而获得各成分频率估计结果。其特色在于,在迭代过程中,可渐进设置频偏范围参数,从而保证各频率成分可稳步地获得高精度估计结果。数值结果表明,该研究提出的多频估计器精度高于现有的多频估计器精度,具有宽广的应用前景。

Frequency estimation of multi-frequency real signals is a fundamental signal processing problem with a wide range of applications,and its accuracy is limited by difficulties in reducing inter-spectral interference of various frequency components.Here,to fundamentally solve this problem,a multi-frequency real signal frequency estimator being able to automatically suppress inter-spectral interference was proposed.Specifically,based on a single-frequency estimator with controllable frequency offset range,two residual signals of descending residual and exclusive residual were iteratively constructed and fed into a single-frequency estimator to obtain various frequency components estimation results.This method’s feature was that during iteration process,frequency offset range parameters can be gradually set to ensure various frequency components being able to steadily obtain high-precision estimation results.The numerical results showed that the accuracy of the proposed multi-frequency estimator is higher than those of existing multi-frequency estimators;it has broad application prospects.