VGOS天线地平遮挡角计算及其对UT1测量的影响  

Calculation of VGOS antenna horizon mask and its impact on UT1 measurement

作　　者：吴徳 舒逢春[1,3] 李金岭 钟胜坚[1,2] 甘江英 WU De;SHU Fengchun;LI Jinling;ZHONG Shengjian;GAN Jiangying(Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Key Laboratory of Space Navigation and Positioning Techniques,Shanghai 200030,China)

机构地区：[1]中国科学院上海天文台,上海200030 [2]中国科学院大学,北京100049 [3]上海市导航定位重点实验室,上海200030

出　　处：《测绘学报》2022年第11期2285-2293,共9页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(12073065,11573056,U2031212)。

摘　　要：上海新建的2台VGOS(VLBI global observing system)天线被其附近原有的大天线遮挡,为了开展VGOS站网的联合观测,提出了一种基于天线几何位置关系的地平遮挡角计算方法。根据台站相对位置、天线口径及天线参考点到边缘点的距离等参数,即可得到VGOS天线的地平遮挡角。天马VGOS天线的最大遮挡角为22.3°,遮挡天区面积占5°以上天区面积的比值为2.19%;佘山VGOS天线的最大遮挡角为23.4°,遮挡天区面积占5°以上天区面积的比值为3.14%。通过在观测纲要中添加天线的地平遮挡角信息,成功实施了VGOS站网的联测。利用VieVS软件仿真分析了天马-维泽尔基线上VGOS天线的UT1测量精度,结果表明,天马VGOS天线的地平遮挡对UT1的测量精度没有显著的影响。The two newly-built VGOS(VLBI global observing system)antennas in Shanghai are blocked by the legacy large antennas nearby.In order to carry out joint observation using the VGOS station network,a new method for calculating the horizon mask based on the geometric position of the antennas is proposed.The horizon mask between the two antennas can be calculated from the geometric position,the antenna aperture and the distance from antenna reference point to the edge of the reflector.The maximum shielding angle of Tianma VGOS antenna is 22.3°,and the ratio between the shielded sky area and the sky area above 5°elevation is 2.19%.The maximum shielding angle of the Sheshan VGOS antenna is 23.4°,and the ratio between the shielded sky area and the sky area above 5°elevation is 3.14%.By adding the horizon mask of the antenna in the scheduling,the joint measurement of the VGOS station network was successfully implemented.The performance of UT1 measurement accuracy of the VGOS antenna on the Tianma-Wettzell baseline is simulated and analyzed by VieVS software.The result shows that the horizon mask of the Tianma VGOS antenna has no significant effect on the measurement accuracy of UT1.

关 键 词：VLBI VGOS 观测纲要 地平遮挡 UT1 

分 类 号：P228[天文地球—大地测量学与测量工程]