China Civil UAV Theory Questions — Questions 153–162

The command processing center formulates UAV flight missions. The UAV ground station system consists of control-station modules with different functions, mainly: ① Command processing center: plan formulation, data processing and application. ② UAV control center: flight manipulation, mission payload control, data link control, communication and command. ③ Payload control center: controls only the onboard mission equipment.

Anti-torque: a helicopter flies mainly on the lift produced by its rotors.

Study note: Scout and Predator are unmanned; the Cessna C-172 is a manned airplane — historically the most successful and most-produced small airplane.

Gliding is a flight state, not a takeoff method.

A person is a person, not part of the system. A typical unmanned aircraft system consists of the aircraft platform, the control station, the communication link, and any other components specified in the approved type design. A UAV system has no pilot, so choose B. The navigation and flight control system is one of the UAV's key core systems, which rules out C.

The flight control computer should have the following functions: ① attitude stabilization and control; ② navigation and guidance control; ③ autonomous flight control; ④ automatic takeoff and landing control. Easily confused content: the flight control subsystem mainly has the following functions: ① UAV attitude stabilization and control [required]; ② completing track control in coordination with the navigation subsystem; ③ UAV takeoff and landing control; ④ UAV mission equipment management and control; ⑤ UAV flight management [required]; ⑥ emergency control [required]; ⑦ information collection and transmission.

Note on turbojet engine components: air intake, compressor, combustion chamber, power turbine, exhaust nozzle (count five and find the power turbine). Turboprop engines are suitable for medium- to high-altitude long-endurance UAVs; exhaust gas temperature affects engine working life.

Textbook p. 38. ① Calculation method: calculate based on given aircraft, passenger, fuel, baggage weights and moments. ② Chart method: use manufacturer-provided charts to simplify calculations. ③ Table lookup method: determine the aircraft center of gravity position by looking up precomputed tables. These tables contain the masses of each part of the aircraft and the relationship between their positions on the aircraft and the center of gravity position. Further reading: chart method https://www.bilibili.com/video/BV1Tc411P7Bi/

Textbook p. 27. The function of the navigation subsystem is to provide the UAV with position, speed, and flight attitude relative to the selected reference coordinate system, guiding the UAV to fly safely, on time, and accurately along a specified route. A complete UAV navigation subsystem has the following functions: ① obtain necessary navigation elements, including altitude, speed, attitude, heading; ② provide positioning information meeting accuracy requirements, including longitude and latitude; ③ guide the aircraft to fly according to the planned program; ④ receive the preset mission route plan and dynamically manage execution of the mission route; ⑤ receive navigation mode control commands from the control station and execute them, with the ability to switch between command navigation mode and preset route flight mode; ⑥ have the ability to receive and fuse auxiliary navigation and positioning information from other UAV equipment; ⑦ cooperate with other systems to complete various missions.

Study note: the option mentioning flight information is the flight-parameter display.