Analysis Method for Wavelet Packet Feature of Ultrasonic Detection Signals of Obstacles in Soil
The ultrasonic detection signal of obstacles in soil is analyzed by the wavelet packet decomposition method.By selecting the sym8 wavelet basis function,the 6-layer wavelet packet decomposition is conducted,and by intercepting the first 16 frequency bands of signal energy concentration,the detailed analysis is carried out.The signals are compared from three perspectives of wavelet packet frequency band energy,wavelet packet frequency band energy entropy and wavelet packet frequency band energy moment.The results show that the wavelet packet frequency band energy entropy of the signal at the location of obstacle and the signal at the location of no obstacle are roughly equal,and cannot be used as a method for signal recognition and obstacle judgment.However,the wavelet packet frequency band energy and wavelet packet frequency band energy moment have significant differences in some frequency bands,and can be used as a method for signal recognition and judgment.
ultrasonic waveobstacle detectionwavelet packetsenergy entropyenergy moment
NETL
NSTL
万方数据
维普
