A cooperative collision avoidance and communication system for railway transports

Automated people movers are employed or projected in some cities all over the world. To explore the possibility of new exploitation modes, a cooperative correlation based radar collision avoidance system is used to identify trains, detect their positions and compute the distance between them. A problem with such a sensor is that it uses pseudo random codes and that the codes currently employed (m.l.f.s.r.: maximum length feedback shift registers) are few in number, so only one can be used at a time in any place to avoid interference. This study looks for new codes available in a larger number, that deliver good performances in the radar system. Some families of codes used in CDMA or other mobile telecommunication systems have been tested. For these tests a radar detection parameter is defined