Analysis and feature extraction of GPS data sequence based on M-band wavelet packet
Xiaoqing Su · Meitan xuebao · 2008
Contraposing the frequency aliasing existing in the algorithm of M-band wavelet packet,measures such as reordering nodes,improved single sub-band reconstruction algorithm were taken to weaken or even eliminate the aliasing.The improved algorithm was used to analyze high-precision GPS data series to obtain the feature of GPS errors,and the feature information with annual cycle,semi-annual cycle,monthly cycle and semi-monthly cycle was extracted based on it.After departing the noise and feature information with wavelet packet transform,error cycle items and feature information cycle items were further extracted separately.The experiment verified the effectiveness of the method.