Small celestial body detector flying-around orbit tracking control method

Abstract

The invention discloses a small celestial body detector flying-around orbit tracking control method, which comprises the steps of designing a nonlinear disturbance observer according to a small celestial body detector flying-around kinetic model under unknown disturbance to estimate external disturbance borne by a detector, and compensating dynamic characteristics of the external disturbance to acontroller; designing an adaptive law to estimate an observation error boundary output by the disturbance observer; introducing a dynamic surface technology to solve the problem of differential explosion caused by derivation of virtual control quantity in adaptive law design; designing a controller combined with a hyperbolic tangent function replacing a sign function; taking the output of the dynamic surface self-adaptive sliding mode controller as the input of a pseudo-rate modulator, enabling the pseudo-rate modulator to output a tuned oscillation pulse for driving a thruster to work, and driving the thruster to generate a control moment on a rolling shaft, a heading shaft and a pitching shaft to counteract an interference moment; the control method disclosed by the invention enables thesmall celestial body detector to achieve high-precision tracking control around the flight section orbit under unknown disturbance.

Description

technical field [0001] The invention provides a tracking control method for a small celestial body detector flying around an orbit, and belongs to the technical field of deep space exploration. Background technique [0002] As "fossils of the solar system", the exploration and research of small celestial bodies is of great significance for human beings to explore the universe. For the detection of small celestial bodies, compared with the detection of the moon and Mars, the probes need to fly farther and for a longer time, and the communication delay with the ground is greater; According to the rules, the probe will be affected by various disturbances such as the gravity of the sun when it orbits a small celestial body. Due to the uncertainty of the small celestial body itself and the surrounding environment, a series of movements such as landing and flying around need to face the complexity of external environmental disturbances, which makes its control method also need to...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a tracking control method for small astronomical probes flying around orbits, which solves the impact of disturbance observation errors on trajectory tracking in the prior art, and at the same time The dynamic surface technology is introduced to solve the differential explosion problem caused by derivation of the virtual control quantity in the adaptive law design, which improves the robustness of the system

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