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London Underground hosts tests for 'quantum compass' that could replace GPS
Subatomic instrument will be able to accurately pinpoint locations under ground and under water where satellite signals cannot reach
While not the average kit you would expect to find being dragged into carriages on the District Line, this is the gear that Cotter – who works at Imperial College London’s Centre for Cold Matter – uses on his underground travels. Photograph: Imperial College LondonBut GNSS devices are vulnerable to bad weather and jamming, and do not work underwater or underground, and their signals are often blocked by tall buildings and other obstructions. The system has been found to work well in a stable laboratory but needs to be tested in more extreme conditions if it is to be turned into a transportable, standalone device that can be used in remote or complex locations, added Cotter.
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