本文選題：副面　切入點：位姿　出處：《上海應(yīng)用技術(shù)大學(xué)》2016年碩士論文

【摘要】：大型射電望遠(yuǎn)鏡在觀測過程中,隨著俯仰角度的變化,副面支撐、背架、主反射面等都有不同程度的變形,這將導(dǎo)致天線效率在高低俯仰角上明顯下降,上海65米射電望遠(yuǎn)鏡副面系統(tǒng)的安裝可以用來補(bǔ)償副面支撐和主面的重力變形,在不同的俯仰角度上,副面位姿的調(diào)整可以提高天線的效率和指向性能。通過在X波段和Ku波段研究副面位姿變化對天線效率的影響,用射電法建立了隨俯仰角度變化的副面位姿隨動調(diào)整模型和副面偏移導(dǎo)致的指向補(bǔ)償模型。用最小二乘法對全天區(qū)數(shù)據(jù)進(jìn)行擬合,得出了8個天線參數(shù)的指向模型,并在實際中驗證,最后建立了上海65米望遠(yuǎn)鏡X波段指向模型。隨機(jī)盲指誤差達(dá)到12.36角秒,滿足了X波段及更長波段的指向要求。采用全息法獲得的口徑面相位擬合了副面在X、Y、Z三個方向的偏移量,并與采用射電源幅度掃描法建立的副面偏移模型進(jìn)行了比較,兩者一致性較好,尤其是Z向擬合情況非常一致。此外還測試了副面隨動與固定對天線效率的影響,結(jié)果表明副面隨動模型可以有效改善上海65米望遠(yuǎn)鏡在高低俯仰角上的效率,使得在整個俯仰角范圍內(nèi),X波段的接收效率均達(dá)到60%以上。
[Abstract]:In the observation process of large radio telescope, with the change of pitch angle, the auxiliary surface support, back frame, main reflector and so on have different degrees of deformation, which will cause the antenna efficiency to decrease obviously in high and low pitch angle. The installation of the auxiliary surface system of the Shanghai 65-meter radio telescope can be used to compensate for the side support and gravity deformation of the main plane, at different pitch angles. The efficiency and directivity of the antenna can be improved by adjusting the pose of the secondary plane. The effect of the change of the position and pose on the efficiency of the antenna is studied in X-band and Ku-band. Based on the radio method, the following adjustment model of the position and pose of the auxiliary plane with the pitch angle and the direction compensation model caused by the offset of the auxiliary surface are established. The data of the whole sky area are fitted with the least square method, and the pointing model of the eight antenna parameters is obtained. Finally, the X-band pointing model of Shanghai 65m telescope is established. The random blind pointing error is 12.36 angle seconds. The aperture plane phase position obtained by holographic method is used to fit the offset of the secondary plane in three directions, and compared with the offset model established by the radio power source amplitude scanning method. In particular, the Z-direction fitting is very consistent. In addition, the effect of the auxiliary surface tracking and fixing on the antenna efficiency is also tested. The results show that the auxiliary surface tracking model can effectively improve the efficiency of the Shanghai 65m telescope in the high and low pitch angle, and the receiving efficiency of X band is over 60% in the whole range of pitch angle.
【學(xué)位授予單位】：上海應(yīng)用技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P111.44

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本文編號：1666414