An Integrated Adaptive Method for Attitude Determination of Nano-Satellites

Abstract

The invention relates to an integrated self-adaptive nano-satellite attitude determination method. Various kinds of sensors including a sun sensor, an earth sensor, a fixed star sensor, a radio frequency sensor, a gyroscope, an accelerometer, a magnetometer and a GPS are integrated; via establishment of a fuzzy controller, the sensors can be chosen and combined by a nano-satellite according to different external environments and different mission requirements. A determined quantity of each sensor in a domain of discourse is converted into a fuzzy set in an underlying variable domain of discourse, corresponding attitude sensors are chosen and combined into an actual attitude determination system via the fuzzy controller, attitude determination system sensor combination solutions for different conditions are obtained, a fuzzy quantity is subjected to clearness improving operation, and a sensor combination solution with a small consumption of star resources is chosen if the post-operation fuzzy quantity is in a critical state. After a corresponding attitude determination system is obtained, output precision of the attitude determination system can be further improved via an extended Kalman filter algorithm.

Description

technical field [0001] The invention relates to an integrated adaptive nano-satellite attitude determination method, which belongs to the technical field of nano-satellite attitude control systems. Background technique [0002] Zadeh proposed the concept of fuzzy sets in 1965 and established the theory of fuzzy sets, which made the theory of fuzzy logic develop by leaps and bounds and has been widely used. Fuzzy decision-making can avoid the mathematical modeling of objects, it can summarize knowledge from people's experience of a certain problem, and extract control rules. The starting point of fuzzy decision-making is the experience of relevant experts, using language methods, which greatly weakens the influence of interference and parameter changes on decision-making results, and is suitable for nonlinear, time-varying and pure lag mathematical models. [0003] In the actual attitude determination work of satellites, there are often many unclear boundaries about how to c...

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Problems solved by technology

[0003] In the actual attitude determination work of satellites, there are often many unclear boundaries about how to choose attitude sensors. It is necessary to solve the problem of selection and combination of attitude sensors under many uncertain conditions. At this time, if the pursuit of The rigor and precision in mathematics will not only hinder the normal operation of the attitude determination system, but also may make wrong decisions under certain circumstances, thus affecting the life of the attitude determination system and the entire satellite

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