Small celestial body detector fly-around section orbit tracking control method based on iterative learning control

Abstract

The invention discloses a small celestial body detector fly-around section orbit tracking control method based on iterative learning control. The method comprises the following steps: establishing a small celestial body dynamic model under external disturbance and unmodeled disturbance; designing a non-linear disturbance observer to estimate external disturbance suffered by a detector, and compensating dynamic characteristics of the external disturbance to a controller; designing a feedback controller to suppress aperiodic disturbance in a fly-around process; designing an iterative learning controller to suppress periodic disturbance in the fly-around process; and combining the output of the controller and the output of the disturbance observer and inputting the output into a pseudo-rate modulator, generating tuning oscillation pulses, turning on the silicon controlled rectifier after receiving a trigger signal, inducing a thruster to generate main discharge, and generating thrust on a rolling shaft, a heading shaft and a pitch shaft. According to the control method disclosed by the invention, under the unknown disturbance of the small celestial body detector, the fly-around section orbit tracking control precision and the system robustness are improved.

Description

technical field [0001] The invention adopts an iterative learning control-based orbit tracking control method for a small celestial body detector around a flying section, and belongs to the technical field of deep space exploration. Background technique [0002] Under the background of promoting the innovation and development of aerospace technology and building a space power, the detection of small celestial bodies can not only explore the origin and evolution of the solar system, the origin of life, and the origin and evolution of celestial bodies, but also carry out research on the defense of dangerous near-Earth asteroids and reduce impacts. Planetary risk is significant. The detection of the small celestial body's orbiting section can not only provide prior information for further detection such as landing, but also can most effectively and completely and accurately understand the small celestial body's topography, gravitational environment and other information. [00...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an iterative learning control based orbit tracking control method for small astronomical detectors around the flight section, which solves the robustness of the detector orbit tracking control caused by various external unknown disturbances in the orbiting section of the small astronomical detectors in the prior art poor problem

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