基于VGOS的GEO卫星观测试验
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摘要
利用中国科学院国家授时中心最新研制的我国首套VGOS(VLBI 2010Global Observation System)系统,对中星12号GEO(geostationary earth orbit)卫星成功开展了观测试验。相关处理使用了我们改进的DiFX软件。国际上的DiFX软件主要针对射电源观测,只有远场时延模型,将其远场时延模型替换为卫星的近场时延模型,从而可以成功处理GEO卫星观测数据。然后使用HOPS软件进行相关后处理,成功得到干涉条纹,时延测量精度约10ps。
By using the newly developed VLBI 2010 observation network(VGOS)of the National Time Service Center(NTSC),Chinese Academy of Sciences,the observation experiment of ZhongXing 12 GEO satellite has been carried out successfully.The DiFX software is improved by NTSC staff and it has been used in correlation processing.Generally,the DiFX software is mainly aimed at the observation of the radio source,and it has only the far field time delay model.After the model is replaced by the near field time delay model of the satellite,the GEO satellite observation data can be processed successfully.Then the interference fringes are successfully obtained by using HOPS software,and the time delay measurement accuracy is about 10 picoseconds.
By using the newly developed VLBI 2010 observation network(VGOS)of the National Time Service Center(NTSC),Chinese Academy of Sciences,the observation experiment of ZhongXing 12 GEO satellite has been carried out successfully.The DiFX software is improved by NTSC staff and it has been used in correlation processing.Generally,the DiFX software is mainly aimed at the observation of the radio source,and it has only the far field time delay model.After the model is replaced by the near field time delay model of the satellite,the GEO satellite observation data can be processed successfully.Then the interference fringes are successfully obtained by using HOPS software,and the time delay measurement accuracy is about 10 picoseconds.
引文
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[2]FUKUSHIMA T.Lunar VLBI observation model[J].Astronomy&Astrophysics,1994,291(291):320-323.
[3]MOYER T D.Formulation for Observed and Computed Values of Deep Space Network Data Types for Navigation[M].California:Wiley Inter Science Publications,2003.
[4]SEKIDO M,FUKUSHIMA T.VLBI delay model for radio sources at finite distance[J].Journal of Geodesy,2006(80):137-149.
[5]SOVERS O J,FANSELOW J L,JACOBS C S.Astrometry and geodesywith radio interferometry:experiments,models,results[J].Review of Modern Physics,1998,70(4):1393-1454.
[6]KAWASE S,TANAKA T.Orbit determination of a geosynchronous satellite by the VLBI technique[J].Journal of the Radio Research Laboratory,1978,26(119):65-71.
[7]SHIOMI T,KOZONO S I,ARIMOTO Y,et al.Orbit determination of a geosynchronous satellite by delta-VLBI method[J].Journal of the Radio Research Laboratory,1984(31):111-132.
[8]舒逢春,张秀忠,郑为民.地球同步卫星的VLBI观测[J].中国科学院上海天文台年刊,2003(24):105-111.
[9]吕林蔚,杨旭海,杨颖,等.GEO卫星信号相关处理关键技术研究及DiFX自相关实现[J].时间频率学报,2015,38(3):171-176.
[10]黄勇,胡小工,张秀忠,等.利用VLBI应用于GEO导航卫星的测定轨[J].科学通报,2011,56(24):1974-1981.
[11]PLANK L,HELLERSCHMIED A.VLBI observations of GNSS satellites:from scheduling to analysis[J].Journal of Geodesy,2017,91(7):867.
[12]TAUSNER M J.General Relativity and its Eects on Planetary Orbits and Interplanetary Observations[K].1966.
[13]杨颖.宽带VLBI系统设计及其应用研究[D].西安:中国科学院国家授时中心,2015.
[14]李政,杨旭海,弓剑军,等.VGOS观测网初步观测及其讨论[J].时间频率学报,2018,41(1):46-56.
[15]DELLER A T,TINGAY S,BAILES M,et al.Difx:a software correlator for very long baseline interferometry using multiprocessor computeing environments[J].Pulications of the Astronomical Society of the Pacific,2007,119(853):318-336.
[16]DELLER A T,BRISKEN W F,PHILIPS C J,et al.DiFX-2:a more flexible,efficient,robust and powerful software correlator[J].Astronomical Society of the Pacific,2011,123(901):275-287.
[17]江悟,沈志强,舒逢春,等.利用DiFX处理CVN天文观测数据进展[J].天文学进展,2014,32(4):516-524.
[18]CAPPALLO R.Correlating and fringe-fitting broadband VGOS data[J].International VLBI Service for Geodesy and Astrometry 2014Meeting Proceeding,2014:91-96.
[19]刘磊,郑为民,张娟,等.中国VLBI网软件相关处理机测地应用精度分析[J].测绘学报,2017,46(7):805-814.
[20]ROGER C.Fourfit User Manual Version 1.0MIT Haystack Observatory[K].2017.
[21]KONDO T,TAKEFUJI K.An algorithm of wideband bandwidth synthesis for geodetic VLBI[J].Radio Science,2016,51(10):1686-1702.