Automatic Identification System, short for AIS, which based on TDMA technology, is a kind of wireless communication system in Marine, be mainly used in identification between ships, between ships and Vessel Traffic Service (VTS).

• 自动识别系统(AIS)，是一种基于时分多址的海上无线通信系统，主要用于海上船只与船只之间、船只与海上交通管理中心之间的相互识别。