This instructable explains how to build an indoor location system with centimeter accuracy for <$ 200 using ultra wideband. do it yourself.
Most indoor location systems make use of wifi, bluetooth, wifi fingerprinting etc and show accuracies within several meters. Ultra wideband systems offer high accuracy (cm range), due to wide signal bandwidth. However, these UWB systems are very expensive, so for a setup where you want to localize something in your project (for example maneuver your lawnmower) you can easily spend > $1000 or more.
We decided to make a universal PCB that can be used as tag or anchor with or without wifi interface and an UWB ranging transceiver. With these diy-kits you can setup an indoor location system consisting for 3 anchors + 1 tag for around $200! And its even less, if you just want to measure the proximity to something... (1 anchor + 1 tag).
In this RTLS system, several anchors were build that dump the ranging data over the local network to a server. This way, long range communication and integration into already existing environments is possible, without having a certain master anchor that calculates the positions and requires alot of processing power. This is also possible, but requires messaging between the anchors and a processor connected to a single anchor (master). However, its more convenient to do this over wifi. A local PC connected to the network receives the data from the LAN in nearly realtime, runs the positioning calculation and draws the position of the tag.
See one of our videos how the results look like. In this instructable we will explain how we build and setup the system.
Update: Jan, 10th, 2017: We just hand soldered and finished a new and smaller tag, which is compatible with the old ones. Nice! Worked straight away. Even nicer! You can see the PCB in the picture. Although the "t" got wiped away in the URL I like it very much...
Please note: this instructable is still in progress... you can also visit us localino.net