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The AURA Train Control System deploys an advanced wireless technology called Ultrawide Band RF (UWB) as a means of providing industry-leading time-of-flight range precision. Within the full train control system, train localization is accomplished through an UWB localization module. This UWB module can be used as a separate system to achieve precision train localization as an integrated element into existing systems (such as CBTC), or as a stand-alone localization tool.
This localization system is called CERTIS. CERTIS can replace traditional RFID and dead-reckoning methods of identifying train position, and subsequently eliminating costly and difficult to install RFID and wheel odometry sensors. CERTIS operates wirelessly by communicating to wayside or trainborne elements to provide positioning information directly into a CBTC system; this includes real-time location tracking, distance to other trains, work zones, signals, platforms, and other key locations.
UWB is incredibly accurate and reliable in all possible deployment locations - especially in subways. UWB signals provide a high degree of security, as it is nearly impossible to isolate against the natural RF background environment. While UWB is capable of transmitting data, CERTIS can be complimented with the use of dedicated data networks to expand the capability of the system and to introduce various multimedia outlets into trains.
CERTIS wayside UWB nodes are spaced between 500-2,000 ft. apart along the wayside, creating an overlapping redundant UWB network. This network is used to identify precise train position down to less than an inch of resolution.