Abstract: A vital programmable logic device (VPD) is provided having at least two microprocessors. The VPD is configured to provide failsafe operation of a vital control system while operating in a closed circuit environment. In at least one embodiment of the present invention, railroad grade crossing signals are controlled by the VPD.

Abstract: Occupancy of a railroad track detection zone by one or more trains is determined using sensor devices located at gateways into and out of the track detection zone. Each sensor device has a sensing range that includes a portion of the railroad track in the detection zone and the sensor device generates data used to uniquely identify each train passing through a gateway and thus the sensing range of one or more sensor devices. Data from the detection zone's sensor device array is collected and evaluated to monitor or track the status of any detected trains and the occupancy of the zone. In some embodiments, the sensor devices utilize anisotropic magnetoresistive sensor elements whose analog waveform data is the basis of magnetic flux peak detection and mapping to generate unique train identification signature data that is transmitted to and evaluated by a detection zone processor, which in some cases can control crossing signals and/or other control apparatus related to the railroad track detection zone.

Abstract: A vehicle detection system is provided for tracking, detecting, and monitoring vehicles. The system and methods of the present invention are suitable for on-track and roadway vehicles. In particular the present invention provides an improved and cost effective system and methods for tracking, detecting and monitoring locomotives and on-track vehicles.

Abstract: A vehicle detection system is provided for tracking, detecting, and monitoring vehicles. The system and methods of the present invention are suitable for on-track and roadway vehicles. In particular the present invention provides an improved and cost effective system and methods for tracking, detecting and monitoring locomotives and on-track vehicles.

Abstract: A vehicle detection system is provided for tracking, detecting, and monitoring vehicles. The system and methods of the present invention are suitable for on-track and roadway vehicles. In particular the present invention provides an improved and cost effective system and methods for tracking, detecting and monitoring locomotives and on-track vehicles.

Abstract: A vital programmable logic device (VPD) is provided having at least two microprocessors. The VPD is configured to provide failsafe operation of a vital control system while operating in a closed circuit environment. In at least one embodiment of the present invention, railroad grade crossing signals are controlled by the VPD.

Abstract: Occupancy of a railroad track detection zone by one or more trains is determined using sensor devices located at gateways into and out of the track detection zone. Each sensor device has a sensing range that includes a portion of the railroad track in the detection zone and the sensor device generates data used to uniquely identify each train passing through a gateway and thus the sensing range of one or more sensor devices. Data from the detection zone's sensor device array is collected and evaluated to monitor or track the status of any detected trains and the occupancy of the zone. In some embodiments, the sensor devices utilize anisotropic magnetoresistive sensor elements whose analog waveform data is the basis of magnetic flux peak detection and mapping to generate unique train identification signature data that is transmitted to and evaluated by a detection zone processor, which in some cases can control crossing signals and/or other control apparatus related to the railroad track detection zone.

Abstract: Power efficient, modular sensor devices utilize magnetic sensor elements, wireless data communication and sensor device level processing to detect, evaluate and classify roadway vehicles. Sensor devices are configured in a network enabling data sharing between sensor devices. Earth generated magnetic fields are monitored within the range of each sensor device with reliability and stability over a wide range of environmental conditions and sensor device placements to detect field distortions specifically caused by a variety of roadway vehicles. Multiple sensor devices configured as a network, communicating with other sensor devices and one or more substations, collect, generate, share and evaluate data to determine multiple attributes of roadway vehicle events. Analog field distortion (waveform) measurements are converted to digital format and analysis on the detected waveform to classify the waveform event as a roadway vehicle of particular type and to determine a unique signature for the waveform event.

Abstract: A vehicle detection system is provided for tracking, detecting, and monitoring vehicles. The system and methods of the present invention are suitable for on-track and roadway vehicles. In particular the present invention provides an improved and cost effective system and methods for tracking, detecting and monitoring locomotives and on-track vehicles.

Abstract: A vital programmable logic device (VPD) is provided having at least two microprocessors. The VPD is configured to provide failsafe operation of a vital control system while operating in a closed circuit environment. In at least one embodiment of the present invention, railroad grade crossing signals are controlled by the VPD.

Abstract: An vehicle detection system is provided for tracking, detecting, and monitoring vehicles. The system and methods of the present invention are suitable for on track and roadway vehicles. In particular the present invention provides an improved and cost effective system and methods for tracking, detecting and monitoring locomotives and on track vehicles.

Abstract: A vital programmable logic device (VPD) is provided having at least two microprocessors. The VPD is configured to provide failsafe operation of a vital control system while operating in a closed circuit environment. In at least one embodiment of the present invention, railroad grade crossing signals are controlled by the VPD.

Abstract: A vital programmable logic device (VPD) is provided having at least two microprocessors. The VPD is configured to provide failsafe operation of a vital control system while operating in a closed circuit environment. In at least one embodiment of the present invention, railroad grade crossing signals are controlled by the VPD.