Small satellite attitude determination system and method thereof

Abstract

The invention discloses a small satellite attitude determination system and a method thereof. The system comprises a plurality of attitude measuring units and a central processing unit; the central processing unit is used for collecting measurement data of the attitude measuring units, calculating environment model and selecting corresponding attitude determination algorithm according to the measurement data and the environment model, so as to determine the attitude. The central processing unit consists of a horizon sensor data sampling and processing unit, a solar sensor data sampling and processing unit, a gaussmeter data sampling and processing unit, an environment model calculating unit and an attitude determination selecting unit. The attitude determination selecting unit selects corresponding attitude determination algorithm according to data of the horizon sensor data sampling and processing unit, the solar sensor data sampling and processing unit, the gaussmeter data sampling and processing unit and the environment model calculating unit, so as to determine the attitude. The small satellite attitude determination system has low cost and simple structure; the small satellite attitude determination system also has various attitude determination algorithms, wherein, four fixed attitude determination algorithms and four Kalman filtering algorithms are designed; the algorithms can be effectively integrated and automatically alternated on the satellite to improve reliability of the system.

Description

technical field [0001] The invention belongs to the technical field of spacecraft, and relates to an attitude determination system and method, in particular to a low-cost, low-power consumption, and high-reliability attitude determination system and method for a small satellite platform. Background technique [0002] Small satellites are widely used in many fields such as communications, scientific experiments, environment and resources, and become an important development direction of satellite technology, attracting the attention of countries all over the world. The attitude control system of the satellite platform is one of the important guarantee systems for the normal operation of the satellite and the completion of the flight mission, and the determination of the satellite attitude is the basis for the implementation of attitude control. It is of great significance to develop a low-cost and high-reliability attitude determination system. [0003] At present, the attit...

AI Technical Summary

Problems solved by technology

Deterministic algorithms mainly refer to direct measurement (such as star sensors and infrared horizons) and dual (or multiple) vector attitude determination algorithms (such as TRIAD algorithm, QUEST algorithm). Deterministic algorithms are simple in calculation but low in accuracy; state estimation methods mainly Refers to the least square method and Kalman filter algorithm. Kalman filter generally uses the combination of gyroscopes and other attitude measurement components to determine high-precision attitude. It is widely used in high-precision large satellite platforms. Foreign countries use only magnetometers or solar Kalman filter attitude determination algorithm combined with sensors, the algorithm is more complicated

The Kalman filter algorithm has a large amount of calculation. The fixed gain form is generally used on the star, and the gain adjustment is performed through the ground injection method. The real-time performance is poor and there is a risk of divergence.

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