Well, it wouldn't be any fun if I told you that. So, I'll let the engineers tell you: https://trs.jpl.nasa.gov/bitstream/handle/2014/46229/CL%2317-6243.pdf?seq

Well, it wouldn't be any fun if I told you that. So, I'll let the engineers tell you: https://trs.jpl.nasa.gov/bitstream/handle/2014/46229/CL%2317-6243.pdf?sequence=1 https://trs.jpl.nasa.gov/bitstream/handle/2014/46229/CL%2317... COTS components abound! In short: "[The Snapdragon] processor implements visual navigation via a velocity estimate derived from features tracked in the VGA camera, filter propagation for use in flight control, data management, command processing, telemetry generation, and radio communication. The SnapdragonTM processor is connected to two flight-control (FC) Microcontroller Units (MCU) via a Universal Asynchronous Receiver/Transmitter (UART). These MCU processor units operate redundantly, receiving and processing identical sensor data to perform the flight-control functions necessary to keep the vehicle flying in the air." They also use Zigbee radios to communicate with the rover.