Marvelmind
Marvelmind Robotics develops and produces Indoor navigation system for UAVs, UGVs and every other object were a beacon can be attached to. The marvelmind system consist out of two different components, on beeing the beacon and the other beeing a modem. The beacon, wich is constantly connected with the modem via a 433MHz radiofrequency, needs to be attached to the object that shall be tracked. The beacons have built-in ultrasonic sensors wich gather the Time of Flight (TOF) to locate the position. Depending on the version of the beacon there is also a integrated IMU to make the positioning even more precise. The tolerancy is very low with ±2cm / 1-3%.
The guidance including configuration examples and further technical data can be found HERE.