風載對大口徑光電望遠鏡跟蹤誤差的影響分析
[Abstract]:The telescope is the most important instrument in astronomical observation. With the development of space observation, the construction aperture of the telescope is becoming larger and larger. For better observation conditions, the telescope site is generally chosen in high altitude areas. One of the most important error sources is the ambient wind load applied to the telescope. Wind load will cause the vibration of the telescope and cause the whole tilt of the beam front received by the telescope observation system.
In this paper, two important sources of Telescope Tracking error, wind load and atmospheric turbulence disturbance, are analyzed theoretically. According to the theory of Engineering Optics and telescope assembly, the aberration caused by the relative displacement of the primary and secondary telescope is analyzed. It is concluded that the tracking error of the telescope caused by wind load is mainly due to the offset sum of the secondary mirror caused by wind load. The secondary mirror vibration model and turbulent turbulence model under dynamic wind load are analyzed in combination with vibration mechanics and atmospheric turbulence time-space characteristics. The results show that the tracking error of the telescope caused by wind load and the integral tilt of the wavefront caused by atmospheric turbulence can be fitted by the second-order AR model.
Secondly, on the basis of modern power spectrum estimation algorithm, a search iteration algorithm based on 2nd-order AR model is proposed. Through continuous search iteration, the error of turbulent power spectrum estimation can be reduced. The power spectrum of telescope tracking error caused by wind load and the integral tilted power spectrum caused by atmospheric turbulence can be effectively divided into two parts. The tracking error of the telescope caused by wind load is analyzed.
Finally, on the 1.8m telescope platform, the tracking errors of the telescope under three typical modes are collected by real-time measurement of ambient wind loads with wind speed anemometer, and the tracking error power spectrum of the telescope under wind load is obtained by using the search iteration algorithm based on the second-order AR model. Wind direction is directly related to wind speed, and wind load acts on the telescope in the truss system rather than the telescope tube.
The theoretical analysis and experimental results in this paper can help us to understand and analyze the influence of wind load on the tracking error of telescope more accurately, and provide a reference for the design of wind-resistant structure of future telescope.
【學位授予單位】:中國科學院研究生院(光電技術(shù)研究所)
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TH751
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