地基行星大气掩星观测资料流程和数据整理  

Processing and Arrangement of Atmospheric Observation Data by Earth-based Planet Occultation

作　　者：毛晓飞[1] 韩婷婷[2] 李磊[1] 张素君[2] 洪振杰[1] 

机构地区：[1]温州大学数学与信息科学学院,温州325035 [2]中国科学院上海天文台

出　　处：《空间科学学报》2010年第6期554-561,共8页Chinese Journal of Space Science

基　　金：国家自然科学基金项目(40605012);国家高技术研究发展计划(2009AA12Z319);浙江省自然科学基金项目(Y506040);浙江省大学生科技创新推广项目(3150601107090426)共同资助

摘　　要：在中国火星探测萤火一号(YH-1)计划中,包括了地基掩星观测反演火星大气的科研任务.观测资料整理是反演流程的第一步.本文描述了地基火星大气掩星观测处理软件系统的观测数据流程和观测资料整理模块,并详细介绍了观测资料整理模块的结构和功能,其中包括时间系统转换、历表插值、坐标系变换、信号时延改正以及掩星平面建立.利用行星数据系统公布的火星快车无线电科学数据和由SPICE得到的地球、火星历表以及火星快车的轨道数据,结合本文的算法,得到了一些实验结果.The technique of planet occultation is one of the most effective methods in detecting Martian atmosphere and ionosphere.Changes in frequency,phase,amplitude and other physical quantities of radio signal from spacecraft,caused by passing through the atmosphere and ionosphere of the planet,were observed in rising and descending planet occultation events.The profiles of the atmosphere,density,temperature and pressure of the neutral atmosphere,and the electron density profile of the ionosphere can be obtained by using some inversion methods.In Chinese YH-1 Mars exploration mission,Earth-based planetary atmosphere occultation is an important scientific research assignment,and observation data arrangement is the first step of the inversion process.This paper presents the data processing of the Earth-based Martian atmosphere occultation processing system, and introduces the structure and function of the observation data arrangement module in detail, including time system transformation,ephemeris interpolation,coordinate system conversion,signal time delay correction and establishing occultation plane.Using our algorithm,some experimental results are generated by using data of MEX Radio Science from NASA Planetary Data System and data of MEX orbit,Earth and Mars ephemeris from MEX SPICE.

关 键 词：行星掩星观测 数据整理 时间系统 坐标变换 掩星坐标系 

分 类 号：P125.4[天文地球—天体测量]