Application of Continuous Wavelet Transform for Time-of-Flight Ranging Applications Using air-Coupled pMUTs

This work presents, for the first time, the use of Continuous Wavelet Transform (CWT) for ultrasonic ranging with air-coupled pMUTs. Wavelets is a powerful mathematical tool which to date has been used towards audio analysis and image processing. Given that wavelets are characterized by two properties, namely scale and time, they could be suitable for pMUT-based time-of-flight (ToF) ranging. The proposed signal processing methodology is experimentally validated with the method achieving a impressive mean accuracy of 95.5%. These experimental results highlight the potential usage of the proposed signal processing methodology for pMUT-based airborne ranging applications.