基于全相位HHT的瞬时频率测量

Instantaneous Frequency Measurement Based on APHHT

全相位谱分析能够很好地抑制频谱泄漏、优化系统性能，其关键技术在于对数据进行全相位预处理。将这一技术运用于HHT求解瞬时频率中，提出了一种全相位HHT的瞬时频率测量算法，分析了全相位预处理和HHT求解瞬时频率的算法，将信号首先进行全相位预处理，然后用HHT算法求解信号的瞬时频率。这种算法是一种优化算法性能的算法，不会过多增加系统的计算量。通过对一非平稳信号分析，验证了基于全相位HHT的瞬时频率方差更小，具有更高的精确性。

All phase spectrum analysis can effectively suppress the leakage of spectrum and optimize the system performance,the gordian technique of this method is the data preprocessing based on all phase. This data preprocessing method was used to measure the instantaneous frequency （IF） based on HHT, and an instantaneous frequency measurement based on all phase HHT （APHHT） was proposed. The algorithm of data preprocessing based on all phase and HHT were analyzed, the signal was first preprocessed by all phase then IF was achieved by HHT. This method is an algorithm for optimizing the system performance, which would not raise the complex of the calculation greatly. Through computer simulation on a non-stationary signal, it can be verified that IF based on APHHT has a small variance, which means it has a higher accuracy.