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You don't need a super-dense AP deployment for location tracking of clients to work. A client that's actively looking for networks to join will occasionally br
by rwg 13y ago
You don't need a super-dense AP deployment for location tracking of clients to work.
A client that's actively looking for networks to join will occasionally broadcast a probe request frame on all of the channels it can transmit on, trying to get nearby access points to respond. If you have at least three access points that "hear" the same probe request and you know where those access points are located, you can use the position information of the access points combined with the received signal strength of the probe request frame at each access point to compute that client's position.
- lifeisstillgood 13y agoIt still sounds unlikely without working it through. I guess the inverse power law applies, and signals are pretty weak to start with, so differences of a few metres will make a big drop. How accurate are these systems (someone implied it came as standard on certain APs)? what is the density for say 50cm resolution - any papers on this? thank you
- lifeisstillgood 13y agojust a quick follow up - I noticed that "is sounds unlikely" is doubting your statement - I am sure the directional / location of wifi is pretty accurate - its just my intuition about such things is so wildly off I would need to do some cacls on signal strength over metres of distance. Interesting thanks