Self-diagnosis the information and measurement system of a small spacecraft with a high level errors in the angular velocity meter

Аuthors

Sedel'nikov A. V.^*, Chugunkov E. V.^**, Taneeva A. S.^***

Samara National Research University named after Academician S.P. Korolev, Moskovskoe shosse, 34, Samara, Russia

*e-mail: axe_backdraft@inbox.ru
**e-mail: 2chugunkov97@mail.ru
***e-mail: 3taneeva.as@yandex.ru

Abstract

 The problem is to improve the performance of the information measurement and control system included in the on-board motion control system for a small Earth remote sensing spacecraft. As a possible solution to this problem, it is proposed to implement the self-diagnostic process of information-measurement system and control system. The peculiarity of this system is the duplication of measuring instruments operating on different principles of action. Fiber-optic gyroscopes are considered as the main means of measuring the angular velocity vector components of a small spacecraft. Despite all the advantages of using these measuring instruments, they have well-known disadvantages. Thus, the increased noise level of angular velocity meters can have a significant influence on the quality of spacecraft orientation and stabilization solutions. This is especially true for high-precision shooting of space and ground objects. In this work, the angular motion of a small spacecraft and the operation of measuring instruments based on fiber-optic gyroscopes are simulated. Next, the accuracy of the model measurements of the angular velocity vector components of a small spacecraft was evaluated. In the numerical simulation, the main characteristics of a small spacecraft of remote sensing of the Earth type «AIST» were used. After carrying out the model measurements, a calibration simulation of the information-measurement and control system based on the reference measuring instrument was implemented. As such, a star sensor was used in this work. This device has a higher accuracy class than fiber-optic gyroscopes. Then, the noise component of fiber-optic gyroscope measurements was evaluated and removed from the measurement data. This has led to a significant improvement in the accuracy of the angular velocity vector components measurements. This is confirmed by the numerical simulation results presented in this paper. Thus, the effectiveness of the proposed approach to estimate vector components of angular velocity of small spacecraft was demonstrated. The presented approach can be used to effectively control the angular motion of a small spacecraft when solving a number of target tasks, for example, high-precision remote sensing of the Earth from space. 

Keywords:

self-diagnosis, angular velocity meter, orientation problem, small spacecraft, noise of measuring instruments

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