Short period sound speed oscillation measured by intensive XBT survey and its role on GNSS/acoustic positioning

Motoyuki Kido, Tohoku University, International Research Institute of Disaster Science, Sendai, Japan, Ryo Matsui, Graduate School Sci., Tohoku Univ., Sendai, Japan, Misae Imano, Tohoku University, Sendai, Japan and Chie Honsho, Tohoku University, Graduate School of Science, Sendai, Japan