Vehicle location system

摘要: A vehicle location system having a plurality of stationary wayside stations positioned at predetermined geographical locations. The passage near station references the that point in time and automatically supplies remote headquarters with updated information as to whereabouts all vehicles operating system. enables low power radio frequency signals communicate error free between by maintaining integrity signal. Automatic transmission precoded message such an emergency communication can be initiated from either or portable transmitter. common channel may used for transmittal both audio digitally encoded messages discriminator each selects displays only those digital communications directed it. Simultaneous automatic transmissions on same are avoided delaying energizing transmitter until preselected is open. Unpleasant distracting noise minimized turning off speaker during reception data.