MEX-M-MRS-1-2-3-PRM-0534

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 Occultation measurement covering the time 20050831T21:21:04.000 to 20050831T21:46:38.000. This data set was collected during the MEX Mission Prime Mission Phase (PRM) 20042005. There were three types of scientific measurements conducted during PRM: 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, Venus Express and Rosetta. 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 Mission Comissioning | MCO | 20031226 20040630 Prime Mission | P 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，这些数据是在火星任务期间收集的。有关调查的更多信息，请参阅MaRS用户手册MARSUSERMANUAL2004，该手册位于MaRS文档/MRS_DOC文件夹中。本数据集涵盖了20050831T21:21:04.000至20050831T21:46:38.000的时间段的掩星测量。本数据集是在MEX任务初级任务阶段（PRM）2004-2005期间收集的。在PRM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，其中需要区分全球重力测量（在大椭圆轨道的远地点附近进行）和目标重力测量（在近地点附近针对特定地球物理结构进行）。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，否则使用搭载在航天器上的应答器1。应答器2被设计为备份。任务阶段定义
值得注意的是，火星快车号（Mars Express，简称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不同，目的是为了保持火星快车号、金星快车号和罗塞塔号的关键词和缩写的一致性。这些任务阶段的缩写也用于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
任务启动 | MCO | 2003年12月26日至2004年6月30日
初级任务 | P（请参阅实际数据以获取完整文本）[请参阅实际数据以获取完整文本]