Abstract: System which is constituted by one or more positioning devices (2), one or more localizers (1), one or several communication networks and one or several control centers (3). The localizers (1) and the positioning devices (2) have two or more communication interfaces and two or more positioning systems. The positioning devices (2) can calculate the 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 localizers can perform the function of nodes (4) and forward the data of the position of a positioning devices and make them reach the localizer which has requested that information. Both the positioning devices and the localizers are mobile units. The control centers can monitor the position of the positioning devices if necessary.

Abstract: The invention relates to a tracking system with redundant security and retransmission features. The invention comprises one or more positioning devices (2), one or more localisers (1), one or more communication networks and one or more control centres (3). The localisers (1) and the positioning devices (2) comprise two or more communication interfaces and two or more positioning systems. The positioning devices (2) can calculate the position thereof using one of the positioning systems and send said position using one of the communication interfaces, thereby ensuring that the system functions if one of the positioning systems or one of the communication interfaces stops operating. The localisers can serve as nodes (4) and retransmit position-related data from a positioning device to a localiser requesting said information. Both the positioning devices and the localisers are mobile. In addition, the control centres can monitor the position of the positioning devices if necessary.