[opencl]

This is a pretty old/widely used technique. Here's a paper about it from 1999, implementing on a DOS PC.

http://www8.cs.umu.se/research/ifor/dl/LOCALIZATION-NAVIGATI...

The really interesting stuff more recently is using RTK software to get accuracy on the order of 10s of cm with cheap GPS receivers.

https://wiki.openstreetmap.org/wiki/RTKLIB

[TeMPOraL]

RTK stands for Real Time Kinematics, for those who (like me) wondered.

[Gen1us2k]

Yes, that's is. This is not unique solution. We collected all information in one article and described what we did.

[emj]

With some hackery you can get an RTKLIB compatible GPS for as low as $30, but one should expect to pay no less than $200-$400 for a ready made solution with an useable antenna. Costs go up fast from there.