中国VLBI观测网对木星低阶重力场解算的贡献  

Contributions of Chinese VLBI Network to the Low Degree Coefficients of the Jupiter Gravity Field

作　　者：刘山洪 鄢建国[1] 叶茂[1] 李斐[1,2] LIU Shanhong;YAN Jianguo;YE Mao;LI Fei(State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China;Chinese Antarctic Center of Surveying and Mapping,Wuhan University,Wuhan 430079,China)

机构地区：[1]武汉大学测绘遥感信息工程国家重点实验室,湖北武汉430079 [2]武汉大学中国南极测绘研究中心,湖北武汉430079

出　　处：《武汉大学学报（信息科学版）》2020年第6期862-869,共8页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(U1831132,41374024,41174019);湖北省自然科学基金创新群体项目(2015CFA011);湖北省杰出青年基金(2018CFA087)。

摘　　要：随着中国深空探测进程的不断推进,研究热点逐渐从月球、类地行星转向气态行星。木星探测任务中,探测器精密定轨软件的研制是探测初期模拟仿真以及任务实施期间无线电跟踪数据处理的重要工具,而其中涉及的木星重力场模型、自转定向模型等相关参数的解算则是重要的科学问题。介绍了自研木星探测器精密定轨及动力学参数解算软件(Jupiter gravity recovery and analysis software,JUPGREAS),并与GEODYN-Ⅱ(geodetic parameter estimation and precision orbit determination system-Ⅱ)进行了对比验证。结果显示,轨道预报7 d的精度在10-4m量级;均使用高斯白噪声为1 mm/s的双程测速观测值进行精密定轨解算,两套软件之间的初轨改正量最大差异为1.84 m。基于JUPGREAS仿真处理了中国深空网和甚长基线干涉测量观测网(Chinese very long baseline interferometry network,CVN)跟踪的木星探测器数据,对甚长基线干涉测量时延和双程多普勒观测量中分别加上0.5 ns和0.5 mm/s的高斯白噪声,其定轨位置误差为0.822 m。结果还表明,相较于单纯使用多普勒数据,加入CVN跟踪的时延数据后,木星重力场带谐项系数解算精度有了明显提高。With the advancement of deep space exploration,the research focus gradually shifts from earth moon and terrestrial planets,such as Mars and Mercury,to gaseous planets.In the Jupiter exploration mission,the development of the precise orbit determination software is an important tool for simulation at the mission planning and processing the radio tracking data during task implementation.It is an important scientific problem to solve the Jupiter gravity field model and the rotation orientation model.We developed a software named as Jupiter gravity recovery and analysis software(JUPGREAS)with independent intellectual property rights.In order to cross-validate check,we compared the results of orbit propagation and precise orbit determination(POD)with the well-known software GEODYN-Ⅱ(geodetic parameter estimation and precision orbit determination system-Ⅱ).The difference of the orbital prediction is at 10-4 m after 7 days.For POD,the position difference is about 1.84 m under the white noise of 1 mm/s.Meanwhile,we analyzed the Jupiter gravity field recovering with the help of the data from Chinese VLBI(very long baseline interferometry)network(CVN).Gaussian white noise of 0.5 ns and 0.5 mm/s is added to the VLBI delay and the two-way Doppler observation,respectively.It is found that the VLBI delay data from CVN could improve the accuracy of the harmonic coefficients of the Jupiter gravity field and the orbital errors is about0.822 m.

关 键 词：精密定轨 木星重力场 木星探测器精密定轨及动力学参数解算软件 甚长基线干涉测量 

分 类 号：P185.4[天文地球—天文学]