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Precise (+2cm) indoor tracking of 2 mobile beacons simultaneously:
- 2 mobile beacons hold by 2 people
- The system uses a time division multiple access. Thus, each mobile beacon's update rate is about 16/2Hz minus some time losses on switching
- Stationary beacons are installed on the walls
- The location data can be obtained either from the mobile beacons on the copter or from the modem attached to the PC via USB (virtual UART)/UART/SPI/I2C

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