There is an increasing need for the rapid exchange of large data files between high-speed trains and wayside facilities. One example is the data exchange requirements of communications-based train control systems. These systems, which rely on on-board and central computers, navigation systems, and communications links between trains and central control facilities, require downloading and uploading of large data files such as track and route characteristics, and train-consist data. There are situations when conventional radio communications links may not be the most effective means for such data exchanges because of factors such as data volume, interference, and communications coverage problems.
Another example is the need to exchange health monitoring and diagnostic data for various train components. Increasingly, such data are collected and stored in computers on board locomotives. High-volume train-towayside communications links are required to down load such data for analysis to provide real-time diagnosis and support the scheduling and management of maintenance and repair activities.
The objective of this IDEA project was to develop a communications system using infrared laser beams and servo-controlled antenna systems to provide high-speed, high-volume data exchange between moving trains and wayside terminals.The concept uses servo-directed laser beams to provide a communications link between a moving train and a railroad wayside terminal. This technology has the potential to transmit 10 seconds. The servo system would enable the trainmounted and wayside antennas to track each other in the brief period during which the high-volume data exchange occurs. Data communications begin when the train is approximately 30 meters from the wayside terminal, and end at a distance of approximately 10 meters. Tracking of the train and wayside terminals is controlled by servo motors that align photo-optic reflectors based on the strength of the laser signals received.
The contractor, State University of New York, worked with Telephonic Corporation, a commercial communications equipment manufacturer, to determine the most effective strategy for the development and marketing of a production version of this system.
The final report for this IDEA project can be found at:
