MEX-M-MRS-1-2-3-EXT2-2839

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 20110402T02:18:05.500 to 20110402T06:42:36.500. This data set was collected during the MEX Extended Mission Phase 2 (EXT2) 2007 to tbd. 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（Mars Express，简称MEX）无线电科学（MaRS）数据存档系按照时间顺序排列的原始数据及部分处理数据的集合，这些数据是在火星快车号执行火星任务期间收集的。关于提议的调查信息，请参阅MaRS用户手册MARSUSERMANUAL2004，位于MaRS文档/MRS_DOC文件夹中。该数据集涵盖全球重力测量，时间范围从20110402T02:18:05.500至20110402T06:42:36.500。该数据集是在火星快车号执行扩展任务第二阶段（EXT2）的2007年至待定期间收集的。这是对火星全球重力场的测量。全球重力测量通常在火星快车号接近远地点时进行。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。在远地点附近进行的是全球重力测量，而在近地点附近针对有趣的地物理结构进行的则是目标重力测量。更多信息请参阅INST.CAT或MaRS用户手册MARSUSERMANUAL2004。除非另有说明，否则所有测量均使用搭载在航天器上的应答器1。应答器2旨在作为备份。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存在差异，以保持火星快车号、罗塞塔号的关键词和缩写的一致性。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
火星快车号 | MEX | 20030602 至 20030731
巡航1 | CR1 | 20030801 至 20031225
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