Aircraft position control system, aircraft, and aircraft position control method

An aircraft position control method comprising:

• acquiring, by a processor, a relative position between an aircraft and a target landing point;
• acquiring, by the processor, a relative velocity of the aircraft with respect to the target landing point;
• calculating, by the processor, a feedback manipulated variable of the aircraft by feedback control so that the aircraft heads toward the target landing point, based on at least the relative position and the relative velocity;
• setting, by the processor, an addition value, by referring to a switching line preliminarily provided in a manner passing through an origin of a coordinate plane having orthogonal axes representing the relative position and the relative velocity and separating an acceleration region in which the relative velocity is increased and a deceleration region in which the relative velocity is decreased, wherein the addition value is set so as to:
• (i) increase the relative velocity when a coordinate point of a current relative position and a current relative velocity is located in the acceleration region with respect to the switching line;
• or (ii) decrease the relative velocity when the coordinate point is located in the deceleration region with respect to the switching line;
• calculating, by the processor, a manipulated variable of the aircraft by adding the addition value, which has been set, to the feedback manipulated variable;
• and
• controlling, by the processor, the aircraft automatically to head toward the target landing point, based on at least the feedback manipulated variable.