MEX-M-MRS-1-2-3-MCO-0091

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 20040624T08:10:03.000 to 20040624T08:44:22.000. 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]

数据集概览：火星快车（Mars Express，简称MEX）无线电科学（MaRS）数据档案是按照时间顺序收集的一系列原始数据及部分处理数据，这些数据是在火星快车任务期间收集的。关于所提议的调查内容，请参阅MaRS用户手册MARSUSERMANUAL2004，位于MaRS文档/MRS_DOC文件夹中。本数据集涉及的时间范围为20040624T08:10:03.000至20040624T08:44:22.000，是对火星大气层进行的掩星测量。该测量在20040329至20040812的第一个掩星季节内，火星进入掩星前的时段进行。这是MEX任务启动阶段（MCO）期间，在航天器围绕火星运行的最初6个月内收集的数据。这是一项针对火星大气的无线电掩星进入测量。在第一个掩星季节内，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，全球重力测量是在远地点附近进行的，而针对目标的重力测量是在近地点附近针对有趣的地球物理结构进行的。详细信息请参阅INST.CAT或MaRS用户手册MARSUSERMANUAL2004。一个例外是20040123（2004年第23天）的数据。这并非真正的科学测量，而是一种纯粹的启动测量。所谓的TWODX程序旨在评估在到达火星后遥测对背景频率噪声的影响。该活动计划使用X波段上行链路和双频段X及S波段下行链路，持续时长为三小时，其中包括一个小时的TM和RNG开启；1100至1200 UTC一个小时的TM和RNG关闭（纯载波），1200至1300 UTC一个小时的TM和RNG开启；1300至1400 UTC数据在ESA新诺西亚地面站被记录。测距仅在X波段可用。请注意：由于星跟踪器出现异常，遥测在1200至1300 UTC之间未关闭。!!!!!!!!!!截断!!!!!!!!，请查看实际数据以获取完整文本。