Differential travel time series of the reciprocal transmission in 1999 ocean acoustic tomography data

The estimation results of the differential travel time series in reciprocal transmission data collected during the tomography experiment performed by JAMSTEC in 1999 at the Central Equatorial Pacific were presented. The complex vector (CV) method was used for the estimation of differential travel times using reciprocal transmissions. An approximate signal position was discriminated using the maximum value of the quotients of the amplitude correlation coefficient and the CV distance between the received and reference signals on the demodulated signal complex plane, in this method. The differential travel time series of -15 path have reasonable magnitudes and the overall trend of low-frequency was caused by mesoscale fluctuations in this oceanic region.