Time-shift phase difference-based high-precision frequency parameter estimation method

• Main Authors: SU ZUQIANG, LI RUI, ZHENG KAI, LUO JIUFEI, XU HAITAO, XIAO HONG
• Format: Patent
• Language: Chinese; English
• Published: 03.11.2017
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The present invention relates to a time-shift phase difference-based high-precision frequency parameter estimation method. The method includes the following steps that: signals are sampled, and three time sequences are constructed; windowing is performed on the three time sequences, and DFT (Discrete Fourier Transformation) is performed; two normalized frequency correction quantity sets are obtained through phase difference; and element distances in the sets are calculated, with a signal energy maximum value adopted as a selection condition, an optimal signal frequency estimation value is selected. With the method of the invention adopted, constrains of the shift coefficients of a conventional time-shift phase difference-based correction method can be eliminated; the noise interference is decreased; the performance of the method can reach the Cramer-Rao lower bound (CRLB) under a certain noise environment; and the method has high anti-noise performance. 本发明请求保护种改基于时移相位差的高精度频率参数估计方法，该方法包括以下步骤：信号的采样并构造三段时间序列；三段