关键词: 频率估计, 分频域, DFT, 信息融合, 迭代计算

Abstract: From the view of trick recognition，features of signal decomposition structure in existing frequency estimation methods are analyzed，based on which，frequency-division-domain decomposition structure is proposed.It organizes several simple signals corresponding to different time into one compound signal.So the given information about time domain can be made use and it will form information accumulation effect to suppress interference frequency and weaken impact noise effectively without incensement in calculation.To match usage of frequency-division-domain decomposition structure and improve real-time performance of analysis，frequency-division equilong fusion algorithm suitable for equilong signals and indirective iterative computation is adopted，and mathematical justification of algorithm correctness is provided.Simulated experiments are carried out under many kinds of application environment，in which better noise immunity，real-time performance and higher frequency estimation precision are shown.

Key words: frequency estimation, frequency-division-domain, DFT, information fusion, iterative computation