Nonlinear active-disturbance-rejection control method for vertically rising and falling repeatedly-used carrier

Abstract

The invention provides a nonlinear active-disturbance-rejection control method for a vertically rising and falling repeatedly-used carrier. The method comprises the following steps of step 1,attitudecontrol model establishment; step 2,TD tracking differentiator design; step 3,nonlinear expansion state observer design; step 4,nonlinear active-disturbance-rejection controller design; and step 5,nonlinear feedback control law design. The nonlinear active-disturbance-rejection control method for the vertically rising and falling repeatedly-used carrier is provided for the defects of longer attitude response time,weak anti-noise ability,lower attitude control precision and the like of an existing active-disturbance-rejection controller,combines a nonlinear TD tracking differentiator with a finite time convergence characteristic,an expansion state observer with fixed time convergence and a nonlinear feedback control law to form a novel nonlinear active-disturbance-rejection controller,thereby improving the complex external interference rejection ability of a system,and also improving the attitude control precision and response speed.

Description

technical field [0001] The invention belongs to the technical field of aircraft control, and in particular relates to a nonlinear active disturbance rejection control method for a vertical take-off and landing reusable carrier. Background technique [0002] After the vertical take-off and landing reusable vehicle finishes the first and second stages of separation after the active flight, the second stage will transport the payload until it enters orbit, and the first stage will quickly perform a large attitude adjustment after separation (the adjustment range of the pitch angle can be from Change from 30° to 180°), and then decelerate the ignition of the main engine for the subsequent flight repair stage to correct the voyage to ensure a good ignition angle. In the attitude-adjusting flight segment, due to the low flight altitude (60-160km), there are many factors such as atmospheric interference, high-altitude wind interference, large sloshing effect of liquid propellant ca...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of fast and stable tracking control of the attitude of the vertical take-off and landing reusable vehicle under the condition of complex external uncertainty interference when the vertical take-off and landing reusable vehicle is flying in the attitude adjustment section, and provides a non-reusable vertical take-off and landing reusable vehicle. Linear Active Disturbance Rejection Control Method

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