本文選題：望遠(yuǎn)鏡 + 方法　； 參考：《天文學(xué)報》2016年01期

【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,天馬65 m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)整模型和指向補(bǔ)償模型.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65 m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波段的接受效率均達(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 plane system of the Tianma 65m radio telescope can be used to compensate the auxiliary surface support and the gravity deformation of the main plane. In different pitch angles, the adjustment of the position and orientation of the auxiliary plane can improve the efficiency and the pointing performance of the antenna. By studying the effect of the variation of the position and attitude of the secondary plane on the antenna efficiency in X-band and Ku-band, the following adjustment model and direction-compensation model of the sub-plane position and attitude with the change of pitch angle are established by radio method. In addition, the effect of auxiliary surface tracking and fixing on antenna efficiency is also tested. The results show that the auxiliary surface tracking model can effectively improve the efficiency of the 65m telescope at high and low pitch angles. The acceptance efficiency of X band is over 60% in the range of pitch angle.
【作者單位】： 上海應(yīng)用技術(shù)學(xué)院電氣與電子工程學(xué)院;中國科學(xué)院上海天文臺;
【基金】：國家自然科學(xué)基金項目(11303076)資助
【分類號】：P111.44
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本文編號：1904939