Back-up Battery
Zenith tethered drone system has a back up battery both in drone and ground station, if any power problem occurs drone will land itself autonomously and the ground station will reel up the cable.
Communication Failsafe
When the communication between ground station and drone is broken, drone will wait for 60 seconds for the operator to establish the communication (tablet battery, etc.) If the communication is not established drone will land itself autonomously.
EKF Failsafe
The EKF failsafe monitors the health of EKF (the position and attitude estimation system) to catch problems with the vehicle’s position estimate (often caused by GPS glitches or compass errors), if the problem continues more than 10 seconds drone will land itself autonomously.