MEX-M-MARSIS-3-RDR-AIS-EXT1

Data Set Overview The Mars Express Mars Advanced Radar for Subsurface and Active Ionospheric Sounding (MARSIS) data set includes all spectral information calibrated in units of spectral density for the Active Ionospheric Sounder over the nominal Mars Express mission. This data set includes calibrated values for each transmit event and the corresponding temporal data for each frequency channel. Parameters This data set comprises the electric field spectral densities obtained via the electric dipole antenna sensor. Processing Data in this data set were processed by the use of a number of software programs. These programs reassembled and decompress the raw telemetry data. These raw values were then calibrated into physical units: power received by the electric antenna. The data products are calibrated using the best calibration tables and algorithms available at the time of data archiving. Should a significant improvement in calibration become available, an erratum will be noted in the erratum section. Later versions of the products may contain better calibrations. Data The AIS calibrated full resolution data set includes several binary tables of wave spectra as a function of time from each of the various transmit events. Each table will contain fixed length records including columns for time, transmit frequency, and spectral densities from the temporal measurements. The number of transmit frequencies is constant at 160 frequencies per frame. Ancillary Data No Ancillary data are provided. Coordinate System The data in this data set are measurements of wave electric fields measured by the MARSIS electric sensors. These fields are presented as detected by the sensors and are not rotated into any other coordinate system. If desired the SPICE kernels can be used with the SPICE toolkit to convert from the spacecraft frame to virtually any frame truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]

数据集概览
火星快车号火星高级雷达地下及活动电离层探测（MARSIS）数据集，涵盖了火星快车号任务期间，针对活动电离层探测器的所有经校准的光谱信息，并以光谱密度单位进行计量。该数据集包含了每次发射事件的校准值及其对应频率通道的时间数据。
参数
本数据集由电偶极子天线传感器获取的电场光谱密度构成。
处理
本数据集中的数据通过一系列软件程序进行处理。这些程序重新组装并解压缩原始遥测数据，随后将这些原始值校准为物理单位：电天线接收到的功率。数据产品使用数据归档时的最佳校准表和算法进行校准。若校准质量发生显著提升，将在勘误部分进行注明。后续版本的产品可能包含更优的校准。
数据
AIS校准全分辨率数据集包含多个二进制表格，记录了来自各个发射事件的波谱随时间的变化情况。每个表格将包含固定长度的记录，包括时间、发射频率和来自时间测量的光谱密度等列。发射频率的数量在每帧中保持恒定，为160个频率。
辅助数据
未提供辅助数据。
坐标系
本数据集中的数据是火星快车号电传感器测量的波动电场。这些场强以传感器检测到的形式呈现，并未旋转至任何其他坐标系。如需转换，可使用SPICE工具包和SPICE内核从航天器坐标系转换为任何虚拟坐标系 [截断！请参阅实际数据以获取完整文本]。