IMPROVED POSITIVE SIGNAL COMPARATOR AND METHOD

摘要

A positive signal comparator system (100) comprises a transceiver (140) located on a train for transmitting an interrogation signal to a wayside signal device (190) and receiving a response signal from the wayside signal device (190), an input device through which an operator enters a signal in response to the signal received from the wayside signal (device190), and a controller (110) including a signal comparator for determining if the signal input by the operator matches the signal received from the wayside signal device and taking corrective action if the operator fails to enter the prope r signal. In some embodiments, the corrective action comprises activating a warning device and/or activating the train's brakes. In some embodiments, th e invention further comprises a display for displaying the signal received fro m the wayside signal generator to the operator.