MEX-M-MRS-1-2-3-MCO-0034

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 20040416T09:02:02.000 to 20040416T09:26:55.900. 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：火星快车号（Mars Express，简称MEX）无线电科学（MaRS）数据档案系按时间顺序排列的原始数据及部分处理数据的集合，这些数据是在火星快车号执行火星探测任务期间收集的。关于提议的调查信息，请参阅MaRS用户手册MARSUSERMANUAL2004，该手册位于MaRS文档/MRS_DOC文件夹中。本数据集涵盖的观测时间范围为20040416T09:02:02.000至20040416T09:26:55.900。这些数据是在火星快车号任务的启动阶段（MCO）期间收集的，即在飞船进入火星轨道前六个月内。本数据集是对火星大气层进行的无线电掩星进入测量。该测量是在20040329至20040812的第一个掩星季节内，在进入掩星前对行星进行的。在MCO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（在远地点附近进行）和目标重力测量（在近日点附近针对感兴趣的地球物理结构进行）。详细信息请参阅INST.CAT或MaRS用户手册MARSUSERMANUAL2004。一个例外是20040123（2004年23日）的数据。这并不是真正的科学测量，而是一种纯粹的启动测量。所谓的TWODX程序旨在评估到达火星后遥测对背景频率噪声的影响。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，持续三小时，其中一小时开启时间码和距离测量；1100至1200 UTC一小时开启时间码和距离测量；1200至1300 UTC一小时关闭时间码和距离测量（纯载波），1300至1400 UTC一小时开启时间码和距离测量；数据由ESA纽诺西亚地面站记录。测距仅在X波段可用。请注意：由于星跟踪器出现异常，在1200至1300 UTC之间未关闭遥测。数据被截断，请参阅实际数据以获取完整文本。