Hello colleagues,
We have a precise (+-2cm) indoor navigation system (Indoor "GPS") that is designed to provide real-time location coordinates for autonomous robots, vehicles.
Demo how it works:
- Precise Indoor "GPS" - small room demo - YouTube - a mobile beacon is traced in real time in small room
- Precise (+-2cm) navigation: Walking with the beacon. Distance up to 30 meters - YouTube - a large scale (up to 30 meters between beacons) demo
Basics: You have stationary beacons (not Bluetooth or WiFi) every 10-50 meters. And you trace a mobile beacon on your robot with +-2cm precision. You get the coordinates either directly from the beacon on your robot via USB or UART or SPI or I2C; or you can get data from the central controller - depending on the needs of your system.
Detailed description of the protocol is available.
More information is on http://www.marvelmind.com/
I will be happy to provide you with more information, if needed.
The most important is that the system is readily available and you can get it within 5-7 days (shipping time) 
We plan implementing the interface of our mobile beacon with some Arduino boards, so the system is absolutely ready to use right away in your projects with the interface code to be open. Now the questions:
- Are you interested in the Indoor Navigation System? For which projects do you consider using it?
- Which Arduino board do you need as a host for the mobile beacon?
Thank you.
Kind regards,
Maxim
email: info@marvelmind.com