Wavelet Packet Threshold Approach to Denoising Piezoelectricity Gyro Signal
Yongxiang Zhang, Xiaoxu Zhao, Huimei Yuan, Weigong Zhang · 2009
Signals output from the gyros usually contain turbulent noise, which comes down the signal accuracy and lowers the systemspsila function. So denoising is necessary. an algorithm, based on three-layer wavelet packet transform of semisoft threshold, was applied to process the gyropsilas state signal. The decomposition coefficient of each node was got from the decomposition of third-layer wavelet packet.We let the high-frequency transient part (greater than threshold) to be zero by a elimination algorithm, reconstructed the nodes to eliminate the noise and period components . This method, compared with soft and hard threshold denoising methods, overcomes their shortcomings and at the same time, its denoisng effects are better than the former two.