Researchers have tested a quantum inertial navigation system on the London Underground metro network. They tested whether the system could provide accurate location information for condition-based monitoring, train control and signalling systems without relying on satellites or trackside equipment. The tests are part of a wider programme led by University of Birmingham spin-off MoniRail to develop an alternative to global satellite navigation systems that works underground, is not affected by building shadows, and is impervious to enemy attack. The current train tracking system is based on satellite-based systems as well as sensors and gyroscopes to measure the distance travelled by a train and determine its location in three-dimensional space. These sensors are to be replaced by quantum systems, which are expected to have an accuracy of 10 cm or better.
