TRACKING SYSTEM WITH REDUNDANT SECURITY AND RETRANSMISSION FEATURES

摘要

System which is constituted by one or more positioning devices (2), one or more localisers (1), one or several communication networks and one or several control centres (3). The localisers (1) and the positioning devices (2) have two or more communication interfaces and two or more positioning systems. The positioning devices (2) can calculate their position through some of the positioning systems and send their position via one of the communication interfaces, avoiding inoperability if one of the positioning systems or one of the communication interfaces fails to work. The localisers can perform the function of nodes (4) and forward the data of the position of a positioning devices and make them reach the localiser which has requested that information. Both the positioning devices and the localisers are mobile units. The control centres can monitor the position of the positioning devices if necessary.