NEWS ~ Super GPS without satellite capable of geolocating to the nearest decimeter in urban areas
To solve the problem of GPS reliability in cities, Dutch researchers have created SuperGPS. Based on the mobile telecommunications network, it allows geolocation to within 10 centimeters, improving, among other things, the reliability of the navigation system of autonomous cars in urban areas.
Current geolocation systems, such as GPS or Galileo, can determine their position to within a centimeter under ideal conditions. They use triangulation based on the signal emitted by orbiting satellites. However, in urban areas, buildings can block or reflect the signal and reduce the accuracy to several meters. Geolocation is then no longer reliable enough for certain uses.
Dutch researchers have developed a new system, called SuperGPS, which allows geolocation in cities with an accuracy of about ten centimeters. Their paper, published in the journal Nature, details how to reuse the mobile telecommunications network as a GPS system.
The mobile system connected to an atomic clock:
SuperGPS would use the mobile antennas already in place. The GPS satellites each contain an atomic clock to keep them synchronized. With SuperGPS, a single atomic clock would be sufficient to synchronize the signals from the antennas, thanks to the fiber optic links. To solve the problem of the signal being reflected or blocked by buildings, their system uses a very large bandwidth. By reusing the mobile network, the researchers were able to slice the signal over limited frequency bands very close to those used by smartphones.
SuperGPS thus offers decimeter-level positioning and sub-nanosecond synchronization. In addition to improved accuracy for mobile devices, this network would be important for quantum communications, as well as for improving the reliability of navigation for autonomous cars in cities.
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