Using GPRS(General Packet Radio Service) permanent on-line,the correspondence speed higher superiority,the system realized the monitoring center and the vehicle carries between the terminal the information real-time alternately.

• 利用GPRS(General PacketRad io Service)永久在线、通信速率高等优势,系统实现了监控中心与车载终端之间信息的实时交互。