MEX-M-MRS-1-2-3-EXT2-1396

Data Set Overview The Mars Express (MEX) Radio Science (MaRS) Data Archive is a timeordered collection of raw and partially processed data collected during the MEX Mission to Mars. For more information on the investigations proposed see the MaRS User Manual MARSUSERMANUAL2004 in the MaRS DOCUMENT/MRS_DOC folder. This is a Global Gravity measurement covering the time 20071221T12:57:48.500 to 20071221T16:28:20.500. This data set was collected during the MEX Extended Mission Phase (EXT2) 20062007. This is a measurement of the Global Gravity field of Mars. Global gravity measurements were typically done when Mars Express was around Apocenter. There were three types of scientific measurements conducted during Extended Mission: Occultation, Bistatic Radar and Gravity where one has to distinguish between global gravity measurements which were conducted around apocenter and target gravity measurements which were conducted around pericenter over interesting geophysical structures. For more information see INST.CAT or the MaRS User Manual MARSUSERMANUAL2004. For all measurements if not indicated otherwise Transponder 1 onboard the s/c was used. Transponder 2 is designed to be a backup. Mission Phase Definition It should be noted that the Mars Express (MEX) Radio Science (MaRS) group uses mission phases which deviate from the ones defined in the MISSION.CAT files given by ESA in order to keep the keywords and abbreviations consistent for Mars Express, and Rosetta. For Venus Express other definitions are used. Those mission phase abbreviations are also used in the data description field of the dataset_id. MaRS mission name | abbreviation | time span Near Earth Verification | NEV | 20030602 20030731 Cruise 1 | CR1 | 20030801 20031225 truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]

数据集概览：火星快车号（MEX）无线电科学（MaRS）数据存档是按照时间顺序排列的原始数据及部分处理数据集合，这些数据是在火星快车号任务期间收集的。关于所提出的调查内容，请参阅MaRS用户手册MARSUSERMANUAL2004，位于MaRS文档/MRS_DOC文件夹中。本数据集为全球重力测量，覆盖时间范围为2007年12月21日12时57分48.5秒至2007年12月21日16时28分20.5秒。该数据集是在火星快车号扩展任务阶段（EXT2）2006年至2007年期间收集的。这是对火星全球重力场的测量。通常在火星快车号接近远地点时进行全球重力测量。在扩展任务期间，进行了三种类型的科学测量：掩星、双站雷达和重力测量。其中需区分在远地点附近进行的全球重力测量和在近地点附近进行的针对特定地球物理结构的重力测量。更多信息请参阅INST.CAT或MaRS用户手册MARSUSERMANUAL2004。对于所有测量，除非另有说明，否则使用搭载于卫星上的应答器1。应答器2设计为备份。任务阶段定义：值得注意的是，火星快车号（MEX）无线电科学（MaRS）小组使用的任务阶段与ESA提供的MISSION.CAT文件中定义的任务阶段有所不同，以保持火星快车号和罗塞塔号的术语和缩写的一致性。对于金星快车号，则使用其他定义。这些任务阶段缩写也用于dataset_id的数据描述字段中。MaRS任务名称 | 缩写 | 时间范围
近地验证 | NEV | 2003年6月2日至2003年7月31日
巡航1 | CR1 | 2003年8月1日至2003年12月25日
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