关键词: 频率估计, 频谱融合, 多段同频等长信号

Abstract: To improve the precision of frequency estimation of signals and extend the application of existing methods, a frequency estimation algorithm for multi-section signals with the same frequency and length based on spectrum fusion is proposed. Firstly, a phase-difference compensating factor is designed to overcome phase discontinuity among different sections of signals and obtain the spectrum for continuous signals. Secondly, a search-frequency array is generated to modify unknown parameters in the phase-difference compensating factor and corrected spectra are gained by the compensated spectra of signals. Thirdly, the spectrum correlation sequence is calculated according to extracted cumulative spectrum and corrected spectra, search its maximum and the corresponding frequency is estimated frequency value. Numerical simulated experimental results demonstrate root mean square error of the proposed algorithm is between 1/4 and 2/3 of existing methods, and its estimation precision approaches Cramer—Rao lower bound.

Key words: frequency estimation, spectrum fusion, multi-section signals with the same frequency and length