Existing positioning systems usually rely on special beacons or on simply fixing position from listening to Wi-Fi access points.
The rate at which signals accumulate phase naturally differs at each frequency.
However, there are some limitations.
Walking is fine, but were not talking about somebody in a car, says Katabi.
However for a drone, its actually better if it moves.
Chronos was able to keep the drone within just 4 cm of its programmed distance.
The researchers are in talks with MIT about commercializing the technology.
Source:IEEE Spectrum
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source: www.techworm.net
