MEX-M-MRS-1-2-3-EXT2-1448

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 20080310T08:14:41.500 to 20080310T12:13:21.500. 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（Mars Express，简称MEX）射电科学（MaRS）数据档案是一系列按时间顺序排列的原始数据及部分处理数据，这些数据是在火星任务期间收集的。有关所提议的调查信息，请参阅MaRS用户手册MARSUSERMANUAL2004，该手册位于MaRS文档夹/MRS_DOC中。本数据集覆盖了20080310T08:14:41.500至20080310T12:13:21.500的时间段，是一项全球重力测量。该数据集是在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。通常在火星快车位于远日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。在此，必须区分在远日点附近进行的全球重力测量和在近日点附近针对有趣地质结构的重力测量。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进行。应答器2设计为备用。任务阶段定义：值得注意的是，火星快车（MEX）射电科学（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，以便保持火星快车和罗塞塔的关键词和缩写的一致性。对于金星快车，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 | 时间段
近地验证 | NEV | 20030602 20030731
巡航1 | CR1 | 20030801 20031225 [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]