REDUNDANT, SELF-DETERMINISTIC, FAILSAFE SENSOR SYSTEMS AND METHODS FOR RAILROAD CROSSING AND ADJACENT SIGNALIZED INTERSECTION VEHICULAR TRAFFIC CONTROL PREEMPTION

摘要

Railroad crossing object detection systems and methods include radar sensors detecting object presence, speed and heading in a different manner. A controller compares signal outputs from the different sensors to provide traffic control preemption signals and self-diagnose sensor problems. The sensor devices may include an ultra-wideband (UWB) impulse radar device and at least one reflective device providing failsafe object presence detection and object non-presence detection in redundant fashion with at least a second sensor device such as a side-fired radar device.