I am creating an application which allows me to locate a tag based on DTOA.
To make this possible, I would like to use the GPS's PPS (Precision Pulse Signal), activate a timer, and interrupt it when I need a timestamp. This will only give a valid (and precise) position, if the clock is fast enough. And since light travels ~30 cm/ns, and I want a precision of ~5 meters, about 16 ns is my breaking point.
So I thought of upgrading some of the existing solutions before creating my own from scratch.
Are any of the gateways Open Source?
Where do I find them?