MEX-M-MARSIS-3-RDR-SS-EXT3

Data Set Overview MARSIS Level 2 data products consist of Level 1b data that have been uncompressed, corrected for Automated Gain Control, aligned to a reference altitude and, except for data acquired using the SS2 mode, rangeprocessed after correcting for the distortion of the transmitted signal caused by the ionosphere. Echoes collected in the acquisition (ACQ) phase, having a much smaller bandwidth, do not have a vertical resolution sufficient for scientific analysis, and thus are not used in generating Reduced Data Records. Geometric information needed to locate observations in space and time is also provided in the Data Set. Parameters MARSIS data are the result of the processing of groups of echoes called frames. A frame is produced by the coherent summation of many tens of echoes. Each frame is recorded as a time series of complex signal samples. Scientific data in a frame are complemented by a set of engineering data, produced by the instrument and recording parameter values used in pulse transmission, echo reception and onboard processing, and by geometric information needed to locate observations in space and time. Processing Level 2 processing of subsurface sounding data consists of several steps, needed to convert the instrument telemetry into a collection of radar echoes that can be used for geological analysis and interpretation of the Martian subsurface. These are: Data decompression: 8bit spectrum samples are converted back to 4byte real numbers. AGC compensation: the gain scaling factor, applied during Automated Gain Compensation, is applied to the data. Receiving time compensation: echoes are shifted in time to refer them to a common altitude above the Martian ellipsoid. Range compression: the received signal is convolved with the transmitted signal to increase range resolution and signaltonoise ratio. Ionosphere distortion correction: an algorithm to c truncated!, Please see actual data for full [truncated!, Please see actual data for full text]

{'Data_Set_Overview': '数据集概览', 'MARSIS_Level_2_data_products': 'MARSIS二级数据产品', 'consist_of': '由...组成', 'Level_1b_data': '一级B类数据', 'uncompressed': '未压缩的', 'corrected_for': '经过...校正的', 'Automated_Gain_Control': '自动增益控制 (AGC)', 'aligned_to': '对齐到', 'reference_altitude': '参考高度', 'except_for': '除了', 'data_acquired_using_the_SS2_mode': '使用SS2模式获取的数据', 'rangeprocessed': '距离处理', 'after_correcting_for': '在纠正...之后', 'the_distortion_of_the_transmitted_signal': '传输信号的失真', 'caused_by_the_ionosphere': '由电离层引起', 'Echoes_collected_in_the_acquisition_phase': '采集阶段收集的回波', 'having_a_much_smaller_bandwidth': '具有更小的带宽', 'do_not_have_a_vertical_resolution': '不具有足够的垂直分辨率', 'sufficient_for_scientific_analysis': '对于科学分析来说是足够的', 'thus': '因此', 'are_not_used_in': '没有被用于', 'generating_Reduced_Data_Records': '生成简化的数据记录', 'Geometric_information': '几何信息', 'needed_to_locate_observations': '用于定位观测', 'in_space_and_time': '在空间和时间上', 'Parameters': '参数', 'MARSIS_data': 'MARSIS数据', 'are_the_result_of': '是...的结果', 'processing_of': '处理...', 'groups_of_echoes_called_frames': '称为帧的回波组', 'A_frame_is_produced_by': '帧是由...产生的', 'the_coherent_summation_of': '相干求和...', 'many_tens_of_echoes': '数十个回波', 'Each_frame_is_recorded_as': '每个帧被记录为...', 'a_time_series_of': '一个...的时间序列', 'complex_signal_samples': '复信号样本', 'Scientific_data': '科学数据', 'are_complemented_by': '被...补充', 'a_set_of_engineering_data': '一组工程数据', 'produced_by_the_instrument': '由仪器产生的', 'recording_parameter_values': '记录参数值', 'used_in': '用于', 'pulse_transmission': '脉冲传输', 'echo_reception': '回波接收', 'onboard_processing': '机载处理', 'and_by_geometric_information': '以及...', 'needed_to_locate_observations_in_space_and_time': '用于定位空间和时间上的观测', 'Processing': '处理', 'Level_2_processing': '二级处理', 'of_subsurface_sounding_data': '地下探测数据', 'consists_of': '由...组成', 'several_steps': '几个步骤', 'needed_to_convert': '需要转换...', 'instrument_telemetry': '仪器遥测数据', 'into': '为...', 'a_collection_of_radar_echoes': '一组雷达回波', 'that_can_be_used_for': '可用于...', 'geological_analysis': '地质分析', 'and_interpretation_of': '和...', 'the_Martian_subsurface': '火星地表以下', 'These_are': '这些包括', 'Data_decompression': '数据解压缩', '8bit_spectrum_samples': '8位频谱样本', 'are_converted_back_to': '被转换回...', '4byte_real_numbers': '4字节实数', 'AGC_compensation': 'AGC补偿', 'the_gain_scaling_factor': '增益缩放因子', 'is_applied_to': '被应用于', 'Receiving_time_compensation': '接收时间补偿', 'echoes_are_shifted_in_time': '回波在时间上被移动', 'to_refer_them_to': '以将它们指向...', 'a_common_altitude_above_the_Martian_ellipsoid': '火星椭球体以上的共同高度', 'Range_compression': '距离压缩', 'the_received_signal': '接收到的信号', 'is_convolved_with': '与...卷积', 'the_transmitted_signal': '传输信号', 'to_increase': '以增加...', 'range_resolution': '距离分辨率', 'and_signal-to-noise_ratio': '信噪比', 'Ionosphere_distortion_correction': '电离层失真校正', 'an_algorithm_to': '一个用于...', 'c_truncated_': '截断', 'Please_see_actual_data_for_full': '请参阅实际数据以获取完整信息'}