MEX-M-MRS-1-2-3-PRM-0222

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 20041212T06:54:38.000 to 20041212T07:24:39.000. This data set was collected during the MEX Mission Prime Mission Phase (PRM) 20042005. This is a radio occultation ingress measurement of the Martian atmosphere. It was done prior entering occultation by the planet during the second occultation season from 20041208 to 20050104. 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 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）数据存档是对火星任务期间收集的原始数据及部分处理数据的时序性汇编。关于所提议的调查信息，请参阅MaRS用户手册MARSUSERMANUAL2004，该手册位于MaRS文档夹下的MRS_DOC文件夹中。本数据集涵盖的掩星测量时间为2004年12月12日06:54:38.000至2004年12月12日07:24:39.000。该数据集是在MEX任务初级任务阶段（PRM）2004年至2005年间收集的。这是一项对火星大气进行的无线电掩星入射测量，在进入由行星引起的第二次掩星季节（2004年12月8日至2005年1月4日）的掩星前完成。在PRM期间进行了三种类型的科学测量：掩星、双基地雷达和重力测量，其中需区分在远地点附近进行的全球重力测量以及在近日点附近针对有趣地球物理结构进行的目标重力测量。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机1。应答机2设计为备用。任务阶段定义
应注意的是，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存在差异，以便保持火星快车号、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 | 时间跨度
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（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]