Control method for fixed-point landing of unmanned aerial vehicle

Abstract

The invention belongs to the technical field of flight control, and discloses a control method for the fixed-point landing of a small fixed-wing unmanned aerial vehicle. Compared with conventional automatic landing control methods, the control method mainly fixes the glide pitch angle of unmanned aerial vehicle landing through an elevator; and the opening degree of an engine throttle can be realized by controlling the elevating rates during glide landing. Thus, through the adoption of the control method, the problems of the strong coupling of altitude trajectory and pitch attitude during the glide landing of the fixed-wing unmanned aerial vehicle can be solved, and the controlling of fixed-point landing can be realized; airspeed self-balancing during glide flight can be realized under the circumstance of inaccurate flight performance data of the unmanned aerial vehicle; and the correctness and feasibility of the control method are verified in actual flight of a 40 kg-grade small unmanned aerial vehicle, and high-precision fixed-point landing control effects can be realized.

Description

technical field [0001] The invention belongs to the technical field of flight control, and relates to the automatic landing flight control of an unmanned aerial vehicle, in particular to a control method for fixed-point landing of a small fixed-wing unmanned aerial vehicle. Background technique [0002] The current UAV fixed-point landing technology has become a new hotspot in the development of advanced control technology of aviation aircraft in the new century. At present, the autonomous landing and rolling recovery of domestic UAVs is very mature, but generally the requirements for the recovery site are relatively high, which limits the use of The use of man-machines can improve the convenience of drone recovery and reduce the scope of use through fixed-point landing. [0003] Conventional taxiing, take-off and landing fixed-wing UAVs fly at a fixed glide angle during landing and glide, generally around 2.5-3°, and the longitudinal trajectory tracking of UAVs directly aff...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a control method for fixed-point landing of UAVs to solve the technical problem that it is difficult to achieve high-precision fixed-point landing due to the strong coupling between the pitch angle and the height trajectory during the landing and glide of the UAV.

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