China Civil UAV Theory Questions — Questions 143–152

UAV-Q0143. A UAV system aircraft platform is mainly an aircraft driven by power that is ________ air.

Explanation

Aircraft fall into lighter-than-air and heavier-than-air types: the former rise on aerostatic buoyancy; the latter overcome their own weight with aerodynamic force.

UAV-Q0144. The ________ sensor is a basic sensor of the flight control system, used to improve the system's damping moment.

Explanation

Quick rule: when you see angular velocity / angular rate, choose it (GPS is the first choice for position). Common sensors of a UAV navigation and flight control system: angular rate sensors; attitude sensors; position sensors (inertial navigation equipment, GPS receivers, magnetic heading sensors); angle-of-attack and sideslip-angle sensors; acceleration sensors; altitude sensors; airspeed sensors. What is an angular rate sensor? An angular velocity sensor, also called a gyroscope, measures changes in angle. It works on the Coriolis principle: a rotating body in inertial space produces a fictitious force proportional to its rotation rate; measuring that force gives the angular velocity. Why does it improve damping moment? By feeding back the UAV's angular rate about its body axes, it improves damping characteristics: the sensor detects rotation rate, the control system uses it to adjust attitude and related parameters, improving damping and stability. When disturbed, the system corrects quickly and restores stable flight.

UAV-Q0145. The function of ________ is to provide the electrical energy meeting predetermined design requirements to the UAV's electrical systems or equipment.

Explanation

Textbook p. 35, §2.1.4, Electrical systems. A point of confusion: supplying power to electrical systems or equipment involves two steps — providing the energy and delivering it — so it takes the power source plus the power distribution system, i.e., the power supply system.

UAV-Q0146. ________ typically includes command and dispatch, mission planning, operation control, display and recording, and other functions.

Explanation

This is the definition of the UAV ground station system. Further reading: the main functions of a UAV ground station are command and control, and mission planning.

UAV-Q0147. ________ together are collectively called the power supply system.

Explanation

Study note: the power source and the power distribution system are the pairing that together make the power supply system.

UAV-Q0148. The ________ band may be used for the UAV system downlink; a radio station working in this band must not affect other legitimate radio services, nor may it seek protection from radio interference.

Explanation

Study note: the UAV downlink band is 2408–2440 MHz.

UAV-Q0149. ________ is the core system for the UAV's entire flight process — takeoff, flight, mission execution, and return and recovery — exercising full control and management over the UAV; this subsystem is to the UAV what the pilot is to a manned aircraft, and it is the key to the UAV's mission execution.

Explanation

How to remember: the stem is quoted from the textbook and explicitly says 'this subsystem,' which rules out 'flight control computer.' The navigation subsystem participates less in flight and is not enough to exercise full control over the UAV, which rules out 'navigation subsystem.'

UAV-Q0150. ________ means the control stick at the control station directly controls the UAV's control surfaces to remotely fly the UAV.

Explanation

The stem explicitly says it controls the 'control surfaces,' so the answer is 'control-surface remote control.' Remote control generally includes three modes: ① Control-surface remote control: the control stick at the control station directly controls the UAV's control surfaces to remotely fly the UAV. ② Attitude remote control: on the basis of an attitude stabilization control mechanism, the control stick controls the UAV's pitch angle, roll angle and yaw angle, thereby changing the UAV's motion. ③ Command control: control commands are sent via the uplink; after the onboard computer receives the commands, it executes them under a predetermined control mode. This mode must be implemented on the basis of an onboard autopilot or an onboard flight management and control system under automatic control.

UAV-Q0151. _____ is similar in function to the UAV control station, but can only control the UAV's onboard mission equipment and cannot control the UAV's flight.

Explanation

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.

UAV-Q0152. _____ is mainly composed of flight manipulation, mission payload control, data link control, communication and command, and can complete manipulation and control of the UAV's onboard mission payload.

Explanation

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.