GPS solves the sync issue to the order of nanoseconds. You can also have local TOA determine angles that get passed up to triangulate. The US Army deployed some of these techniques in antisniper work in Iraq.
That's a good point, and required time precision seems like it should be proportional to the velocity of the signal being investigated. I had some bad experiences trying to use gps time for RDF, but that might not apply here.
> Our time synchronization approach yields errors signif-
icantly less than 100 microseconds. As the sound travels
about 3 cm in that time, time synchronization errors have a
negligible effect on the system.
Sounds like it?
The anti-sniper systems I knew about already (Boomerang) are that single-site setup where time sync isn't a problem. The "Individual Gunshot Detector" sounds more like what you're describing.
> The Individual Gunshot Detector (IGD) by Qinetiq consists of a shoulder-mounted unit with four acoustic sensors and a chest display that attaches to body armor.
Still looking for more detail, but that sounds like a local ToA > pass up angles for triangulation type deal.
