关键词: 频率估计, 积分方程, 特征频率

Abstract:

In traditional frequency estimation algorithms , there exists a general problem arising from the discrepancy between the costly computation and the unsatisfactory performance under low SNRs (Signal-to-Noise Ratios). In order to solve this problem , this paper proposes a new frequency estimation algorithm based on the IIE (Inversion Integral Equation) approach. In this algorithm , FIT (Fast Fourier Transform) is used to roughly estimate the frequency , based on which an IIE is constructed according to the narrow-band signal resulting from FIT. Then , the fine frequency is estimated by calculating the parameters and characteristic frequency of the IIE. Simulated results show that the proposed algorithm is of good performance and moderate computationaI requirement under low SNRs.

Key words: frequency estimation, integral equation, characteristic frequency