Last stage orbit remaining application subsystem attitude control method

Abstract

The invention discloses a last stage orbit remaining application subsystem attitude control method. The method includes the steps that when a last stage orbit remaining application subsystem is in a rate damping period, an attitude controller adopts a Minus B-dot magnetic control law, a three-axis magnetic torquer is used as an execution mechanism for applying control magnetic torque, so that theangular speeds of a pitching axis, a rolling axis and a deviation axis of the last stage orbit remaining application subsystem are damped, and the last stage orbit remaining application subsystem is racemized; and when the last stage orbit remaining application subsystem is in a steady state control period, the attitude controller adopts a PD control law with time-lag compensation on a pitching loop, a bias momentum wheel and the three-axis magnetic torquer are used as execution mechanisms for applying the control magnetic torque, so that attitude control of the pitching loop is finished, anda rolling / yawing loop adopts sliding mode controller design. The sun pointing problem of the last stage orbit remaining application subsystem is solved, meanwhile, time-lag influence is eliminated, and the attitude control accuracy of the last stage orbit remaining application subsystem is improved.

Description

technical field [0001] The invention belongs to the technical field of spacecraft control, and relates to an attitude control method, in particular to an attitude control method of the last sub-stage orbital application subsystem. Background technique [0002] In the past, after every rocket launch in various countries, as the first stage rocket, the second stage rocket and the fairing fall off and return to the ground, the last stage of the rocket will enter orbit along with its payload and occupy precious orbital resources in space for a long time. It poses a safety threat to spacecraft in orbit and is currently the largest space junk. Using the measurement system carried by the last sub-stage of the launch vehicle to stay in orbit, the original last sub-stage of the rocket can be transformed into a low-cost scientific experiment and communication platform, which can turn waste into treasure. [0003] The attitude of the traditional aerospace vehicle is controllable, and ...

AI Technical Summary

Problems solved by technology

However, for the last stage of the rocket, its attitude is constantly spinning and accompanied by certain nutation in space, and the process of collecting signals by the sensor, the calculation and processing process of the controller, and the actuation process of the actuator will all produce time lags, giving The design of the measurement and control system and the energy system brings difficulties, it is difficult to achieve orientation to the sun, and it is impossible to obtain effective and controllable data

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