MEX-M-MRS-1-2-3-EXT2-3049

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 20110730T14:21:50.500 to 20110730T16:59:56.500. 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 four types of scientific measurements conducted during Extended Mission: Solar Conjunction, Occultation, Bistatic Radar and Gravity where one has to distinguish between gravity measurements conducted on Phobos as well as global gravity measurements on Mars which were conducted around apocenter and target gravity measurements on Mars 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 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，MEX）无线电科学（MaRS）数据档案库是一系列按时间顺序排列的原始及部分处理数据集，这些数据是在火星快车号火星任务期间收集的。有关拟进行的调查信息，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，时间范围为2011年7月30日14:21:50.500至2011年7月30日16:59:56.500。此数据集收集于火星快车号扩展任务第二阶段（EXT2）2007年至待定时间。本数据集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，共进行了四种类型的科学测量：太阳 conjunction、掩星、双站雷达和重力测量。在重力测量方面，需区分在火卫一上进行的重力测量以及在全球重力测量上进行的火星重力测量，这些测量在远地点附近进行，以及围绕近地点在有趣的地物理结构上进行的目标重力测量。更多信息请参见INST.CAT或MaRS用户手册MARSUSERMANUAL2004。对于所有测量，除非另有说明，否则使用卫星上的应答器1。应答器2被设计为备用。任务阶段定义 应予以注意的是，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，使用其他定义。这些任务阶段缩写也用于数据集_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（截断，请参阅实际数据以获取完整文本）[截断，请参阅实际数据以获取完整文本]