In acoustic velocity measurement method

based on TDOA or PDOA

nonlinear phase response caused by group delay of transducer is a major factor that limits measurement precision.A narrowband linear model is adopt to describe the phase response curve in working band of transducer

and verifies through correlation detection and multi-frequency point measurement experimental methods.Results show that the narrowband linear model is agreeable with real phase response of transducer in working frequency band

and can used to accurately estimate acoustic velocity.