China Civil UAV Theory Questions — Questions 253–262

In-flight replanning dynamically adjusts the flight path or changes actions when unexpected situations occur during flight; unknown threat areas are unexpected situations, such as temporarily designated no-fly / restricted-fly areas. Known threat areas and the UAV's own constraint conditions are information known in advance and should be considered in pre-flight planning.

Because a UAV pilot controls the aircraft from the ground, the pilot cannot perceive the aircraft's inertia and gravity changes through the vestibular sense. Further reading: the vestibular sense, also called the sense of balance or static sense, is an internal sense in human sensation. It mainly receives and processes movement and position information from inside the body, especially the head and neck. This sense relies mainly on the vestibular organs of the inner ear, including the three semicircular canals, the utricle and the saccule. When the body performs various movements, these vestibular organs sense changes in head position and motion and transmit this information to the brain. The vestibular sense plays a crucial role in the human balance system. Together with the cerebellum, the visual system and the proprioceptive system, it maintains human balance and posture.

Mission planning determines how the UAV completes its flight mission; track planning is the core content.

Textbook original text: we can define UAV instrument flight as a UAV flight operator using the flight stick in attitude remote control or direct control-surface operation modes. Autonomous control requires no UAV pilot control and does not count as instrument flight.

GPS: United States; GLONASS: Russia; Galileo: Europe; BeiDou: China.

A GPS receiver outputs the carrier's latitude and longitude, velocity and elevation. GPS determines the carrier's spatial position and time through triangulation and can calculate ground speed, but cannot calculate airspeed.

Study note: ignoring batteries, choose longer in winter. In winter, temperatures are low, air pressure is high, air density is high, lift increases, fuel consumption decreases, and flight time increases.

Three points not on the same line determine a plane; the option is A.

The mission planning workflow includes: accepting the mission, understanding the mission, assessing the environment, allocating tasks, planning the track, optimizing the track, and producing the plan.

A route transfer strategy means transferring from any point on the route into a safe return corridor, or from a safe return corridor to an emergency forced-landing point or airport.