Automatic serialization of an array of wireless nodes based on coupled oscillator model

摘要

A linking process allows a head-end unit (HEU) of a railroad train to determine the sequence of cars in the train using wireless links between nodes on the cars, and requires no physical connection between the nodes or cars. Each car in the train is equipped with a wireless communication device which models an oscillator i. Each oscillator is phase-variable, the phase &thgr;.sub.i linearly increasing from 0 to 1 such that, when the i.sup.th oscillator "fires", transmitting a packet, and phase &thgr;. sub.i then jumps back to zero. When a car receives the transmission of another car, it changes the phase of its oscillator according to a phase- response curve function, setting up a wave pattern of transmission from nodes, from one end of the train to the other end. The wave pattern, along with protocol logic, enables each car to determine the sequence in which cars are arranged in its vicinity. The protocol logic also enables each car to forward or relay this "local map" from all cars to the HEU, allowing the HEU to construct the entire train map which is the sequence of cars in the train. The compiled train map is compared with consist information and the operator is notified of any discrepancy.