MEX-M-MRS-1-2-3-MCO-0075

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 20040614T04:35:58.500 to 20040614T06:29:40.000. This data set was collected during the MEX Mission Comissioning Phase (MCO) during the first 6 months the spacecraft was in orbit around Mars. This is a radio occultation ingress measurement of the Martian atmosphere. It was done prior entering occultation by the planet during the first occultation season from 20040329 to 20040812. There were three types of scientific measurements conducted during MCO: 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. One exception are the data from the 20040123 (DOY 23/2004). This was not really a science measurement but rather a pure comissioning measurement. The so called TWODX procedure was supposed to assess the influence of telemetry on the background frequency noise after arrival at mars. The activity was planned with an Xband uplink and a dualfrequency Xand Sband downlink for a length of three hours with One hour TM and RNG ON; 1100 1200 UT One hour TM and RNG OFF (pure carrier), 1200 1300 UT One hour of TM and RNG ON; 1300 1400 UT Data were recorded at ESA New Norcia ground station. Ranging was only for XBand available. Please note: Because of an anomaly with the star tracker, the telemetry was not switched off between 1200 and 1300 UT. !!!!!!!!!!! truncated!, Please see actual data for [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）数据档案是一系列按时间顺序排列的原始及部分处理数据，这些数据是在火星快车号执行火星任务期间收集的。关于提议的调查内容，请参阅MaRS用户手册MARSUSERMANUAL2004，该手册位于MaRS文档/MRS_DOC文件夹中。本数据集涵盖的时间范围为2004年6月14日04:35:58.500至2004年6月14日06:29:40.000的掩星测量。此数据集是在火星快车号任务的启动阶段（MCO）期间收集的，即在该航天器进入火星轨道后的前六个月内。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掩星之前进行，该掩星发生在2004年3月29日至2004年8月12日的首次掩星季节。在MCO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。在这些测量中，必须区分全球重力测量（在远地点附近进行）和目标重力测量（在近地点附近对感兴趣的地球物理结构进行）。有关更多信息，请参阅INST.CAT或MaRS用户手册MARSUSERMANUAL2004。一个例外是2004年1月23日（2004年第23天）的数据。这并不是真正的科学测量，而是一次纯粹的启动测量。所谓的TWODX程序旨在评估到达火星后遥测对背景频率噪声的影响。此次活动计划使用X波段上行链路和双频段X和S波段下行链路，持续时长为三小时，其中有一个小时的时间进行遥测和测距数据采集；1100至1200UT有一个小时的时间关闭遥测和测距数据采集（纯载波），1200至1300UT有一个小时的时间进行遥测和测距数据采集；1300至1400UT。数据由ESA纽诺西亚地面站记录。测距数据仅适用于X波段。请注意：由于星跟踪器出现异常，遥测数据在1200至1300UT之间未关闭。数据被截断，请参阅实际数据以获取完整文本。