Tag sputnik

From OpenBeacon Wiki

The Sputnik project is a system for real time in-building location tracking using the OpenBeacon Tag. It was first implemented at the 23rd Chaos Communication Congress in December 2006.

There's some high-level information on The official 23C3 Sputnik page

The OpenBeacon Tag is used in combination with 25 base stations to facilitate in-building location tracking. The tags periodically transmit frames at different power levels. If the packet is received by one or more base stations, we can deduct some idea about its locality.

The base stations don't exploit timing differences or triangulation but rather only use the signal strength for positioning.

The output of the base stations is fed into the Chaos Positioning System (CPS), which provides some more high-level and abstract way of maintaining and distributing positioning information.

Firmware Source Code

• Subversion access: http://svn.openbeacon.org/trunk/tag/transponder-23c3/
• Tarball: http://www.openbeacon.org/dl/23C3/openbeacon-029.tar.bz2