How does WiFi GPS coordinate calculation work?

[mikebills]

Hi all,

I wrote my own WiFi AP collection application for an embedded linux device and I'd like to calculate the approximate GPS coordinate for an AP. What's the best way to calculate the location of an AP given 3 GPS coordinates and 3 RSSI readings of the said AP? I wrote a simple linear extrapolation algo but I'm not sure if that's the best way to do it. Once done, I'll release an app under GPL so if anyone knows of any GPL/BSD licensed code please let me know.

Thanks!

Mike

[bobzilla]

We incorporate signal strength, as noted in the FAQ:
http://wigle.net/gps/gps/main/faq/

Most of our effort is in filtering data that comes in, if you have known-good samples that you've made yourself you're probably be in for an easier time.