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The US Air Force (USAF) has signed a deal to develop a new platform that could solve the problem of unreliable global positioning system (GPS) tracking in densely populated urban areas. It could also help drivers, but through cars rather than mobile ... devices. While a sophisticated technology, the principle of how GPS works is remarkably simple. A fleet of satellites orbit the Earth at a consistent speed, meaning their precise location at any particular moment is known. Each satellite is constantly beaming signals to the ground, with each signal bearing a timestamp. As soon as a device on the ... (view more)