Variable-period control method of satellite emergency system

Abstract

Provided is a variable-period control method of a satellite emergency system. On the basis of reasonably designing a satellite emergency state attitude determination algorithm, the system control method with the control period changing with environmental changing in the operation process of emergency software is designed according to the current interrupt counting control period realizing mode and the state of a selected sensor (top). When selection of the sensor (top) is not changed, top mounting matrix selection, pseudo-inverse (matrix) solving and other complex calculation processes are not carried out during each control period, and attitude determination is carried out through saved values; otherwise, top mounting matrix selection and pseudo-inverse solving calculation are carried out again. Interrupt counting is not updated again in the attitude determination process through top mounting matrix reselection and pseudo-inverse solving, the control period is prolonged objectively, and the problem of overtime of calculation of the control period is avoided. The problem that the requirement for an unnecessary long control period is caused by complex repeated calculation is avoided, the control effect of the spacecraft emergency system is improved, and control duration under attitude offset is shortened.

Description

technical field [0001] The invention belongs to the field of attitude control of spacecraft, and relates to a method for controlling a variable period of a satellite emergency system. Background technique [0002] The satellite control emergency system is the last safety measure of the satellite control system. It mainly realizes the sun search mode control and the switch operation of each component, ensures the energy supply of the whole star, and buys time for the rescue work of the satellite. [0003] The emergency system generally adopts 80C32E processor chip, and the input clock frequency is 11.0592MHz. Because the 80C32E processor uses an 8-bit arithmetic logic unit and does not have a special floating-point processing unit, it is quite time-consuming to use 32-bit floating-point calculations on the 80C32E processor. The implementation of emergency system software tasks will inevitably involve certain floating-point calculations, especially the calculation process of ...

AI Technical Summary

Problems solved by technology

This control scheme is clear in thinking and easy to implement, but it lacks flexibility in terms of time. The control period is often preset based on experience. Under normal circumstances, it is necessary to set a longer control period and allow a certain time threshold, otherwise the task will be executed. timeout, causing the control scheme to fail

Since the control cycle is pre-set according to experience, there will also be a problem that the long control cycle will lead to a long idle time of the satellite emergency system software, resulting in a waste of system resources

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