A guy makes 3D maps of wifi signals. The results are very interesting! - Page 1
Forum section: electronics / general

author: Rerouter
author_rank: Super Contributor
timestamp: March 21, 2015, 09:48:47 am
content: next thought would be gsm and gps signal stength, or what it looks like when you turn on a second router with the same channel vs a different channel, as a way to quanitfy how it changes it (i would expect a beat pattern for it, but i dont know what that would resemble in 3D)

author: EEVblog
author_rank: Unknown
timestamp: March 21, 2015, 11:10:33 am
content: Quote from: Rerouter on March 21, 2015, 09:48:47 amCue someone with a quadcopter programmed with a 3D grid search pattern.

author: Muttley Snickers
author_rank: Unknown
timestamp: March 21, 2015, 11:39:25 am
content: I would imagine that this type of mapping technology could also be usedin reverse to track the route of customer's that had a mobile phone onthem in larger retail outlet's. The flock of sheep alway's go this way.Muttley

author: Kjelt
author_rank: Super Contributor
timestamp: March 21, 2015, 06:17:31 pm
content: Very interesting, so if you have a bad connection just shift 6 to 12 cm on the couch.... Done!

author: Neganur
author_rank: Unknown
timestamp: March 21, 2015, 06:17:41 pm
content: I wonder how much the mill itself influenced the field as it moved through the space he measured.

author: xrunner
author_rank: Super Contributor
timestamp: March 21, 2015, 06:26:19 pm
content: Quote from: Neganur on March 21, 2015, 06:17:41 pmRight - it's tough because the mill has metal parts and moving the mill thus creates added complexity at that frequency due to reflections, but it's pretty interesting even so.

author: funkyant
author_rank: Unknown
timestamp: March 21, 2015, 06:57:27 pm
content: I think it's undeniable that the metal and magnetic parts of the mill must have had some impact on the results, but it was interesting where he noted the correlation to wavelength.I am constantly plotting graphs like this in my field of work:Above is a recent sound system design (obviously the goal is to have the least amount of sound wave interaction), and if you put loudspeakers in the wrong place, you can certainly end up with crazy sums and cancellations like in the Wifi plot.

author: Someone
author_rank: Super Contributor
timestamp: March 21, 2015, 08:57:23 pm
content: Quote from: Muttley Snickers on March 21, 2015, 11:39:25 amIts already done in both directions. With a sufficiently detailed database you can determine a devices location very accurately by the mix and signal strength of wireless access points it can see, google already has this running on a huge scale. In reverse there are organisations using distributed access points (and or bluetooth nodes looking for discoverable devices) that will follow you around their space, its used in some shopping centres and some larger retail shops.

author: Jeroen3
author_rank: Super Contributor
timestamp: March 21, 2015, 09:43:38 pm
content: Because it is used to track people in shopping centre's, you can get apps that will randomly change your broadcasted unique ID's on your smartphone when you're not connected to a network.http://bgr.com/2014/02/03/chainfire-pry-fi-android-app/I didn't knew the cancellation of wifi was that much when using a small antenna.