Acoustic Travel-Time Estimation by Fast Correlation Combined with Up-Sampling

The key for acoustic temperature field measurement is to measure acoustic travel-time accurately. Restricted by sample interval, the acoustic travel-time estimation accuracy by fast correlating of the transmitted and the received signals is not high enough. A new method based on fast correlation combined with up-sampling is proposed. Ideal anti-imaging filters are implemented in frequency domain. Simulation research in MATLAB shows that it has much higher estimation accuracy compared with the fast correlation method. The larger the up-sampling factor, the higher the accuracy will be.