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天马望远镜(上海65 m射电望远镜)于2012年10月完成了第一阶段建设并具备了S/X,L,C波频段的VLBI观测能力.2013年12月全程参加了嫦娥三号着陆器和月球车X频段的VLBI测定轨测定位任务.在嫦娥三号中,利用天马望远镜代替上海佘山25 m射电望远镜,使中国VLBI观测网的灵敏度提高至1.67倍.同时,利用2比特采样代替嫦娥二号的1比特采样,使灵敏度提高至1.38倍.上述两项措施使定轨后的ΔDOR型VLBI时延残差由嫦娥二号时的1.77 ns降至嫦娥三号时的0.67 ns,着陆器和月球车同波束VLBI差分相时延随机误差降至0.011 ps rms.本文在介绍天马望远镜及其X频段致冷接收和数据采集系统的基础上,对其在嫦娥三号测定轨VLBI观测中的应用进行分析.
The Pegasus Telescope (65 m radio telescope in Shanghai) completed the first phase of its construction and was capable of VLBI observation in the S / X, L and C band in October 2012. In December 2013, it participated in the Chang’e III lander and Lunar rover X-band VLBI measurement track task.In the Chang’e III, the use of Tianma telescope instead of Shanghai Sheshan 25 m radio telescope, so that China VLBI observation network sensitivity increased to 1.67 times the same time, the use of 2-bit sampling instead of Chang’e II 1 bit sampling, the sensitivity increased to 1.38 times the above two measures so that the orbit of the ΔDOR VLBI delay residual error from 1.77 ns at Chang’e II to 0.99 ns at Chang’e III, the lander and The random error of lunar rover VLBI differential phase delay is reduced to 0.011 ps rms.Based on the introduction of the Tianma telescope and its X-band refrigeration receiver and data acquisition system, this paper applies the VLBI observation of Chang’e III orbit Analyze.