There's a protocol for multilateration of the detected jets using all of the receivers that are in range of its signal. Whil I'm sure there are ways you could attack it, it's pretty robust to the more obvious things.
The mlat is more for receiving aircraft that use traditional transponders which don't include gps coordinates but just a squawk code and altitude. Hence it needs multiple receivers to triangulate their location. I don't think it uses this for real adsb feeds.
