Autonomous underwater glider（AUG）is a new kind of underwater vehicle driven by changes of the gravity center and the net buoyancy.In order to meet the request of long-term

large-scale investigations on the ocean

a communication system integrating RF channel and Ir satellite is designed.Aiming at the instability of the communication link of Iridium Satellite on the ocean

an improved Xmodem communication protocol is designed to guarantee the validity and the reliability of communication during AUG executing ocean survey.Through sea trials

it shows that the communication system and the improved Xmodem protocol meet application reguirement for AUG to upload experimental data.