Wavelet Packet Threshold Approach to Denoising Piezoelectricity Gyro Signal

Signals output from the Gyros usually contain turbulent noise, which comes down the signal accuracy and lowers the systems’ function. So denoising is necessary. an algorithm, based on three-layer wavelet packet transform of semisoft threshold, was applied to  process the gyro’s 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.