Shaft Accuracy Analysis And Error Parameter Identification Of Two-axis Tracking And Pointing Device

Accuracy is one of the most important performance indexes of precision instruments and precision equipment, and it is also a standard to evaluate the quality of a kind of instrument.This passage takestwo axis tracking and pointing system as the research object,based on the accuracy ofthe tracking and pointing system,emphatically analyzes the axis sloshing and the two axis unperpendicularwhich cause the arming error.Hoping to find a way to accurately identify the factors of causing the above errors.At present, the method of solving the above problems is based on the principle of independencein many literatures. This method only considerone influence factorto identify at once,changingthe other oneafter the identification.This model's geometry is complex andit also can not reflect the interaction between various factors, so it has many deficiencies.In order to analysis the impact on pointing accuracy of the two axis tracking and pointing device caused byabove factors and identify the error sources,weput forwarda new method, which is based on the principle of relativity, using the method of the quaternionsrotation, taking axis shaking as rotations around one certain shaft. First, around a shaft to rotate an angle,and then around the other shaft rotate another angle. In this way, it will be able to take all the factors into account and avoid complex geometric relations.If the built model is correct, we can use this model combinewith the experimental device which is designed in this paper to measure all kinds of two axis mechanicaldevices, identifying the factors that affect the accuracy of the shaft, such as axis shaking and two axis unperpendicularity. It is very meaningful to further improve the accuracy of the mechanical device in the case of difficulity to improve the control accuracy.According to the above idea, establishing a mathematical model in this paper, which is able to identify the error caused by axis shaking andthetwo axis unperpendicularity.In addition, based onelectronic level meter can be used to measure small angle of relative horizontalplane, designing a experimental device to test whether the built is correct. At last, using the designed device to carry out a simulation analysis forthe built model,proving the correctness of the bulit model.The main work of this thesis isdiscussingthe thought and method of the mathematical model, which is built by using the method of quaternions. Then, designingexperimental detection device system and analysising the results of measurement simulation.