MEX-M-MRS-1-2-3-EXT2-2082

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 20090902T21:02:12.500 to 20090902T23:26:04.500. 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]

数据集概述：火星快车号（Mars Express，简称MEX）无线电科学（MaRS）数据档案系按时间顺序排列的原始及部分处理数据集合，这些数据在火星任务期间被收集。有关拟议的调查信息，请参阅MaRS用户手册MARSUSERMANUAL2004，位于MaRS文档/MRS_DOC文件夹中。该数据集覆盖了从20090902T21:02:12.500至20090902T23:26:04.500的时间段内的全球重力测量。此数据集是在MEX扩展任务阶段2（EXT2）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。其中，需要区分在远地点附近进行的全球重力测量和围绕近地点在有趣的地球物理结构上进行的靶重力测量。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，否则使用在航天器上的应答机1。应答机2被设计为备用。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dataset_id数据描述字段中。MaRS任务名称 | 缩写 | 时间段
近地验证 | NEV | 20030602 20030731 巡航1 | CR1 | 20030801 20031225 被截断！请参阅实际数据以获取完整文本 [被截断！请参阅实际数据以获取完整文本]