NSSDCA ID: PSPG-00849
Availability: Archived at NSSDC, accessible from elsewhere
Time span: 2003-07-01 to 2003-07-11
This description was generated automatically using input from the Planetary Data System.
Data Set Overview ================ The Mars Express (MEX) Radio Science (MaRS) Data Archive is a time-ordered 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 Commissioning measurement covering the time 2003-06-29T14:44:10.000 to 2003-06-30T00:56:13.000. This data set was collected during the MEX Mission Near Earth Verification Phase (NEV) - shortly after launch. No specific measurement was done on this day but the configuration was tested. Testing was done during the NEV, CR1 and partly MCO Mission phase. During NEV several comissioning measurements were performed which had to purpose to test the radio transponders and oscillator aboard the space craft as well as the equipment at the ground stations mainly at the new ESA ground station New Norcia (NNO). For more information see INST.CAT or the MaRS User Manual [MARSUSERMANUAL2004]. Overview of perfomed measurements: DOY 180, 2003-06-29: Tracking at New Norcia performed in the so called TWOD-X configuration. That is, X-Band uplink at IFMS 1 and X and S-Band coherent and simultanous downlink. Doppler recording was performed all the time. -18:00 UTC: TM ON, Ranging ON -19:45 UTC: TM OFF, Ranging OFF -23:45 UTC: TM ON, Ranging ON -01:00 UTC: End of operation Data sample rate was 1/sec. DOY 182, 2003-07-01: Tracking at New Norcia performed in the so called TWOD-X configuration. That is, X-Band uplink at IFMS 2 and X and S-Band coherent and simultanous downlink. Doppler recording was performed all the time. -18:00 UTC: TM ON, Ranging ON -19:05 UTC: TM OFF, Ranging OFF -23:05 UTC: TM ON, Ranging ON -00:05 UTC: End of operation Data sample rate was 1/sec. DOY 183, 2003-07-02: Tracking at New Norcia performed in the so called TWOD-S configuration. That is, S-Band uplink at IFMS 1 and X and S-Band coherent and simultanous downlink. Doppler recording was performed all the time. -18:20 UTC: TM ON, Ranging ON -19:20 UTC: TM OFF, Ranging OFF -23:30 UTC: TM ON, Ranging ON -01:20 UTC: End of operation Data sample rate was 1/sec. DOY 187, 2003-07-06: Parallel tracking pass at Deep Space Network (DSN) station DSS 43 (70 meter station also uplinking) and New Norcia (only listening). Space craft was in ONED mode that is uplink was switched off during operation. But there was X-and S-Band downlink. Doppler recording was performed all the time. Data recording at DSN: TNF (closed loop) and RSR (open loop) data. Data recording at NNO: Doppler, Meteo, Auto Gain Control and Ranging files at a sample rate of 1/sec. -15:00 UTC: Space craft is in TWOD-X configuration, TM ON, Ranging ON -16:00 UTC: Begin of ONED activity, Ranging off, TM ON (??) -17:05 UTC: TM OFF and Ranging OFF -19:08 UTC: TM ON -20:07 UTC: X-Band Uplink up. End of ONED, begin of normal TWOD-X. Ranging ON -21:08 UTC: End of activity Two-way Ranging and Doppler recordings were done before and after the ONED activity. DOY 191, 2003-07-10: Parallel tracking pass at Deep Space Network (DSN) station DSS 43 (70 meter station also uplinking) and New Norcia (only listening). Space craft was in ONES-X mode that is uplink was switched off during operation. Only X-Band downlink. Doppler recording was performed all the time. Data recording at DSN: TNF (closed loop) and RSR (open loop) data. Data recording at NNO: Doppler, Meteo, Auto Gain Control and Ranging files at a sample rate of 1/sec. -13:15 UTC: Begin of activity, Ranging ON, TM ON, space craft was in TWOS mode (X-Band up- and downlink) -14:02 UTC: Uplink was dropped, TM ON, spacecraft in ONES-X mode. -14:25 UTC: Begin of track at New Norcia, Begin of measurements at NNO, TM ON -15:05 UTC: TM OFF -17:06 UTC: TM ON -18:11 UTC: X-Band Uplink up. End of ONES, begin of normal TWOS. Ranging ON, TM ON -19:16 UTC: End of activity DOY 192, 2003-07-11: Tracking at DSN at the Goldstone complex in the TWOD-S mode. That is, S-Band uplink at IFMS 1 and X and S-Band coherent and simultanous downlink. Doppler recording was performed all the times. - 18:30 UTC: TM ON, Ranging ON - 19:45 UTC: TM OFF, Ranging OFF - 23:45 UTC: TM ON, Ranging ON - 00:55 UTC: End of activity. Mission Phase Definition ======================== It should be noted that the Mars Express (MEX) Radio Science (MaRS) group uses mission phases which deviate from the ones defined in the MISSION.CAT files given by ESA in order to keep the keywords and abbreviations consistent for Mars Express, Venus Express and Rosetta. Those mission phase abbreviations are also used in the data description field of the dataset_id. MaRS mission name | abbreviation | time span ================================================================ Near Earth Verification | NEV | 2003-06-02 - 2003-07-31 ---------------------------------------------------------------Cruise 1 | CR1 | 2003-08-01 - 2003-12-25 ---------------------------------------------------------------Mission Comissioning | MCO | 2003-12-26 - 2004-06-30 ---------------------------------------------------------------Prime Mission | PRM | 2004-07-01 - 2005-11-30 ---------------------------------------------------------------Extended Mission | ENT | TBD ---------------------------------------------------------------Data files ---------Data files are: The tracking files from Deep Space Network (DSN) and from the Intermediate Frequency Modulation System (IFMS) used by the ESA ground station New Norcia. Level 1a to level 2 data are archived. The predicted and reconstructed Doppler and range files Geometry files All Level 1a binary data files will have the file name extension eee = .DAT IFMS Level 1a ASCII data files will have the file name extension eee = .RAW Level 1b and 2 tabulated ASCII data files will have the file name extension eee = .TAB Binary data files will have the file name extension .DAT Data levels ---------It should be noted that these data levels which are also used in the file names and data directories are PSA data levels whereas in the PDS label files CODMAC levels are used. PSA data level | CODMAC level ----------------------------1a | 1 1b | 2 2 | 3 Data Set Identifier ------------------The 'DATA_SET_ID' is a unique alphanumeric identifier for the data sets. It looks something like: XXX-Y-ZZZ-U-VVV-NNNN-WWW Acronym | Description | Example -------------------------------------------------------XXX | Instrument Host ID | MEX -------------------------------------------------------Y | Target ID | M (for Mars) -------------------------------------------------------ZZZ | Instrument ID | MRS -------------------------------------------------------U | Data level (here | 1/2/3 (Data set | CODMAC levels are used) | contains raw, edited | | and calibrated data) --------------------------------------------------------VVV | MaRS mission phase |MCO | (deviate from the |(for values see above) | mission phases) | --------------------------------------------------------NNNN | 4 digit sequence number | 0123 | which is identical to | | the number in Volume_id | --------------------------------------------------------WWW | Version number | V1.0 MaRS data were originally archived as volumes rather than data sets. However, ESA PSA does not uses volume but data set. To avoid confusion it was specified that one MaRS data volume is equal one data set. Thus the data set was also assigned a 4 digit sequence number which is identical to the one used in the volume_id. If the data_set_id is known it is automatically specified on which volume the data set is found. VOLUME_ID --------The VOLUME_ID is a unique alphanumeric identifier for volume. It looks something like: XXXXXX-ZZZZ Acronym | Description | Example -------------------------------------------------------XXXXXX | Mission and Instrument ID | MEXMRS -------------------------------------------------------ZZZZ | 4 digit sequence number | 0123 Descriptive files ----------------Descriptive files contain information in order to support the processing and analysis of data files. The following file types are defined as descriptive files with extension eee = .LBL PDS label files .CFG IFMS configuration .AUX Anxiliary files (event files, attitude files, ESOC orbit files, products, SPICE files) .TXT Information (text) files File naming convention ====================== All incoming data files will be renamed and all processed data files will be named after the following file naming convention format. The original file name of the incoming tracking data files will be stored in the according label file as source_product_id. The new PDS compliant file name will be the following: rggttttlll_sss_yydddhhmm_qq.eee Acronym | Description | Examples ============================================================= r | space craft name abbreviation | M | R = Rosetta | | M = Mars Express | ------------------------------------------------------------gg | Ground station ID: | 43 | | | 00: valid for all ground stations | | | | DSN complex Canberra: | | --------------------- | | 34 = 34 m BWG (beam waveguide) | | 43 = 70 m | | 45 = 34 m HEF (high efficiency) | | | | ESA Cebreros antenna: | | --------------------- | | TBD = 35 m | | | | DSN complex Goldstone: | | ---------------------- | | 14 = 70 m | | 15 = 34 m HEF | | 24 = 34 m BWG | | 25 = 34 m BWG | | 26 = 34 m BWG | | 27 = 34 m HSBWG | | | | ESA Kourou antenna: | | ------------------- | | TBD = 15 m | | | | DSN complex Madrid: | | ------------------- | | 54 = 34 m BWG | | 55 = 34 m BWG | | 63 = 70 m | | 65 = 34 m HEF | | | | ESA New Norcia antenna: | | ----------------------- | | 32 = 35 m | ------------------------------------------------------------tttt | data source identifier: | TNF0 | | | Level 1a and 1b: | | ---------------- | | ODF0 = ODF closed loop | | TNF0 = TNF closed loop (L1a) | | T000-T017 = TNF closed loop (L1b) | | ICL1 = IFMS 1 closed loop | | ICL2 = IFMS 2 closed loop | | ICL3 = IFMS RS closed loop | | IOL3 = IFMS RS open loop | | R1Az = RSR block 1A open loop | | R1Bz = RSR block 1B open loop | | R2Az = RSR block 2A open loop | | R2Bz = RSR block 2B open loop | | R3Az = RSR block 3A open loop | | R3Bz = RSR block 3B open loop | | z=1...4 subchannel number | | ESOC = ancillary files from ESOC DDS | | DSN0 = ancillary files from DSN | | | | Level 2: | | ------- | | UNBW = predicted and reconstructed | | Doppler and range files | | IFMS = ESA IFMS files | | ODF0 = DSN ODF closed loop file | | T000-T017 = TNF closed loop file | | RSR0 = DSN RSR open loop file | | NAIF = JPL or ESTEC SPICE Kernels | | GEOM = geometry file | | | --------|------------------------------------------|-------lll | Data archiving level | L1A | L1A = Level 1A | | L1B = Level 1B | | L02 = Level 2 | | L03 = Level 3 | --------|------------------------------------------|-------sss | data type | | | | IFMS data files level 1A & 1B: | | ------------------------- | | D1X uncalibrated Doppler 1 X-Band | | D1S uncalibrated Doppler 1 S-Band | | D2X uncalibrated Doppler 2 x-Band | | D2S uncalibrated Doppler 2 S-Band | | C1X Doppler 1 X-Band equip. calibration | | C1S Doppler 1 S-Band equip. calibration | | C2X Doppler 2 X-Band equip. calibration | | C2S Doppler 2 S-Band equip. calibration | | RGX uncalibrated X-Band range | | RGS uncalibrated S-Band range | | MET meteo file | | AG1 AGC 1 files | | AG2 AGC 2 files | | RCX X-Band range equip. calibration | | RCS S-Band range equip. calibration | | | | DSN data files level 1A: | | ------------------------- | | ODF original orbit files (closed loop) | | RSR radio science receiver open-loop file| | TNF file (closed loop) | | BRO bistatic radar 4-panel plots (browse)| | | | ESOC ancillary data level 1A: | | ----------------------------- | | ATR attitude file, reconstrucetd | | EVT orbit event file | | OHC orbit file, heliocentric cruise | | OMO orbit file, marscentric, operational | | | | DSN ancillary data level 1A: | | ----------------------------- | | DKF DSN Keyword File | | MON DSN monitor data | | NMC DSN Network Monitoring Control file | | SOE DSN Sequence of Events | | TRO DSN tropospheric calibration model | | MET DSN meteorological file | | ION DSN ionosheric calibration model | | | | DSN ODF data files level 1b: | | ----------------------------- | | DPS S-Band Doppler | | DPX X-Band Doppler | | RGS uncalibrated S-Band ranging file | | RGX uncalibrated X-Band ranging file | | RMP uplink frequency ramp rate file | | | | DSN ancillary data level 1B: | | ----------------------------- | | MET meteorlogical file | | | | data level 2: | | ------------- | | D1X uncalibrated Doppler 1 X-Band | | D1S uncalibrated Doppler 1 S-Band | | D2X uncalibrated Doppler 2 x-Band | | D2S uncalibrated Doppler 2 S-Band | | RGX uncalibrated X-Band range | | RGS uncalibrated S-Band range | | RCX X-Band range equip. calibration | | RCS S-Band range equip. calibration | | BSR bistatic radar power spectra | | SRG bistatic radar surface reflection | | geometry file | | | | orbit files level 2: | | -------------------- | | PTW Doppler & range prediction two-way | | PON Doppler & range prediction on | | RTW reconstructed Doppler & range orbit | | file two-way | | RON reconstructed Doppler & range orbit | | file one-way | | LOC heliocentric state vector file | | | | Constellation file Level 2: | | --------------------------- | | MAR Mars constellation file | | VEN Venus constellation file | | P67 Churyumov-Gerasimenko | | constellation file | | | | SPICE kernel files level 2: | | --------------------------- | | BSP binary spacecraft/location | | kernel file | | FRM frame kernel file | | ORB orbit numbering file | | PBC predicted attititude kernel file | | PCK planetary constant kernel | | SCK space craft clock kernel | | TLS leap second kernel file | --------|------------------------------------------|-------yy | Year | 04 --------|------------------------------------------|-------ddd | Day of year | 153 --------|------------------------------------------|-------hhmm | Sample hour, minute start time | 1135 | For IFMS files this is the ESOC | | reference time tag which usually | | coincides with the first sample time. | | For IFMS Ranging files however this is | | not true. Here the reference time tag | | is twoway light time before the first | | actual measurement. | --------|------------------------------------------|-------qq | Sequence or version number | 01 --------|------------------------------------------|-------eee | .DAT binary files (Level 1a) | .RAW | .TAB ASCII table data file | | .AUX ancillary file | | .CFG IFMS configuration file (Level 1b) | | .LBL PDS label files | | .TXT information files | | .RAW ASCII data files (Level 1a) | Structure of DATA Directory --------------------------Please note that the following description lists all possible subfolders. If however there is no data to fill some of these folders they will not be generated. DATA | |----LEVEL1A | | | |-----CLOSED_LOOP | | | | | |-------IFMS | | | | | | | |-----AG1 Auto Gain Control 1 files | | | | | | | |-----AG2 Auto Gain Control 2 files | | | | | | | |-----DP1 Doppler 1 data files | | | | | | | |-----DP2 Doppler 2 data files | | | | | | | |-----RNG Ranging files | | | | | |-------DSN | | | | | | | |-----ODF Orbit Data files | | | |-----TNF Tracking Navigation Files | | | |-----OPEN_LOOP | | | | | |-------IFMS | | | | | |-------DSN | | | |-------RSR Radio Science Receiver Data files | |----LEVEL1B | | | | |-----CLOSED_LOOP | | | | | |-------IFMS | | | | | | | |-----AG1 Auto Gain Control 1 files | | | | | | | |-----AG2 Auto Gain Control 2 files | | | | | | | |-----DP1 Doppler 1 data files | | | | | | | |-----DP2 Doppler 2 data files | | | | | | | |-----RNG Ranging files | | | | | |-------DSN | | | | | | | |-----ODF Orbit Data files | | | |-----OPEN_LOOP | | | | | |-------IFMS | | | | | | | | | |----LEVEL2 | | | |-----CLOSED_LOOP | | | | | |-------IFMS | | | | | | | | | | | |-----DP1 Calibrated Doppler 1 data files | | | | | | | |-----DP2 Calibrated Doppler 2 data files | | | | | | | |-----RNG Calibrated Ranging files | | | | | |-------DSN | | | | | | | |-----ODF Orbit Data files | | | |-----OPEN_LOOP | | | | | |-------IFMS | | | | | |-------DSN | | | | | | | |-----RSR Radio Science Receiver Data files Files in the DATA Directory ---------------------------Files in the DATA directory are: Data Level 1a: -------------Level 1a data are incoming raw tracking data files obtained either from ESA IFMS or DSN. All incoming data files will be renamed after the file naming convention format defined in section 4.1 of the MaRS File Naming Convention document [MARSFNC2004] and get a minimal detached label file .LBL. The original file name of the incoming tracking data files will be stored in the according label file as SOURCE_PRODUCT_ID. These files have the file extension .RAW if ASCII and .DAT if binary files. Data Level 1b: -------------Level 1b files are processed from level 1a (raw tracking data) into an edited ASCII formatted file. Three files are generated for each ESA IFMS Level 1a data file: Level 1b IFMS data file (extension .TAB) Level 1b IFMS configuration file (extension .CFG) Level 1b IFMS label file (extension .LBL) The label file contains the description of the .TAB as well as of the .CFG file. Up to eight files are generated for each DSN ODF Level 1a file: Level 1b ODF Doppler S-Band data file + label file Level 1b ODF Doppler X-Band data file + label file Level 1b ODF Ranging S-Band data file + label file Level 1b ODF Ranging X-Band data file + label file Cologne is processing IFMS and ODF data, Stanford University processes RSR data up to level 2 and forwards raw and processed data to Cologne for archiving. However, for RSR there will be no level 1b files. Data Level 2: -----------Level 2 data are calibrated data after further processing. The file format is in ASCII. This data level can be used for further scientific interpretation. The keyword OBSERVATION_TYPE in the Level 2 data labels indicates which kind of measurement was done. Keyword values are: Occultation, Target Gravity, Global Gravity, Solar Conjunction, Bistatic Radar, Commissioning and Phobos Gravity. Commissioning covers the NEV, CR1 and partly MCO Mission Phase where no specific measurement was done but equipment on board the spacecraft and on ground station was tested. IFMS Level 2 input files: -----------------------There may be several Doppler 1 X-Band files in level 1a which will be merged on level 2. The same is true for all other Doppler file type and Ranging X and S-Band files. Only files with continous sequenced numbers (the file names are the same only the sequence number varies for these files) are merged together. Otherwise a new Level 02 data file is created (merging data files with a new sequence of files). The level 2 source_product_id however gives the RAW IFMS file names since the raw files are used for processing. But the content of the IFMS raw files are identical to the corresponding level 1a IFMS files in one data set, only the file name is different. And the source_prodict_id of the level 1a files gives the original raw IFMS files. In addition the level 1A files have almost the same file name as the corresponding level 2 files. The corresponding level 1A files can be found in DATA/LEVEL1A/CLOSED_LOOP/IFMS/DP1 for Doppler 1 files DATA/LEVEL1A/CLOSED_LOOP/IFMS/DP2 for Doppler 2 files DATA/LEVEL1A/CLOSED_LOOP/IFMS/RNG for Ranging files ---------------------------------------------------------------Example: M32ICL1L02_D1X_040931103_00.TAB is a level 2 Doppler 1 X-Band file in M32ICL1L02_D1X_040931103_00.LBL the following SOURCE_PRODUCT_ID is given: SOURCE_PRODUCT_ID = {NN11_MEX1_2004_093_OP_D1_110358_0000, NN11_MEX1_2004_093_OP_D1_110358_0001, NN11_MEX1_2004_093_OP_D1_110358_0002} which are the raw IFMS files. The corresponding Level 1A files can be found in DATA/L1A/CLOSED_LOOP/IFMS/DP1 Their names are: M32ICL1L1A_D1X_040931103_00.RAW M32ICL1L1A_D1X_040931103_01.RAW M32ICL1L1A_D1X_040931103_02.RAW and the corresponding label files give the source_product_id as: in the M32ICL1L1A_D1X_040931103_00.LBL file the source_product_id is given as: SOURCE_PRODUCT_ID = NN11_MEX1_2004_093_OP_D1_110358_0000 in the M32ICL1L1A_D1X_040931103_01.LBL file the source_product_id is given as: SOURCE_PRODUCT_ID = NN11_MEX1_2004_093_OP_D1_110358_0001 in the M32ICL1L1A_D1X_040931103_02.LBL file the source_product_id is given as: SOURCE_PRODUCT_ID = NN11_MEX1_2004_093_OP_D1_110358_0002 Note that in this example the three level 1A files were merged to one level 2 files. The file names of the level 1a files are almost identical to the level 2 file name with three differences: - L1A instead of L02 in the file name which tells the user that these are level 1A and level 2 files. - The two digit-sequence number at the end of the file can be different. - The level 1A files have file extension .RAW whereas level 2 files have file extension .TAB ----------------------------------------------------------------Other inputs for Doppler and Ranging files: -----------------------------------------predicted orbit file (see EXTRAS/ANCILLARY/UNI_BW) Meteorological file (see CALIB/CLOSED_LOOP/IFMS/MET) AGC file (see DATA/1A or 1B/CLOSED_LOOP/AGC1 or AGC2) Spacecraft orbit SPICE kernels (see EXTRAS/ANCILLARY/SPICE can also be downloaded from ftp://solarsystem.estec.esa.nl/pub/projects/MEX/data/spice ) Calibration Documentation: ------------------------For documentation about Doppler and Ranging Calibration please see in DOCUMENT/MRS_DOC/MEX_MRS_IGM_DS_3035 and MEX_MRS_IGM_DS_3036 For differential Doppler: -----------------------If the processed level 2 file is for example Doppler 1 X-Band then information from IFMS raw Doppler 1 S-Band files which cover approximately the same time were used for processing as well. For Doppler 1 S-Band information from IFMS raw Doppler 1 X-Band files were used. Doppler 2 files were processed accordingly. In most cases on IFMS1 and IFMS2 X-Band data were recorded: The corresponding raw files' names start with NN11_ or NN12_ . S-Band data were in most cases recorded at IFMS3. The corresponding raw files' names start with NN13_. If for some reason this configuration was changed this is indicated either at the beginning of this description or at the end in the anomaly report. For Ranging in addition are used: -------------------------------Range calibration file (see CALIB/CLOSED_LOOP/IFMS/RCL) Klobuchar coefficients for Earth ionosphere calibration (can be downloaded from this site http://www.aiub.unibe.ch/download/CODE/) The calibrated Doppler files contain observed IFMS sky frequency, X-band Doppler and S-band Doppler frequency shift, residual (computed using the predict file), and the differential Doppler. If only a single downlink frequency was used, a differential Doppler cannot be computed and was set to zero in the output file. The level 2 ranging files contain the observed TWLT at X-band or S-band, the calibrated TWLT at X-band or S-band, the TWLT delay at X-band or S-band and the differential TWLT. If only one frequency was used, the differential TWLT is set to zero. IFMS Level 2 output files: -----------------------Level 2 IFMS data file (extension .TAB) Level 2 IFMS label file (extension .LBL) Level 2 IFMS log file (extension .LOG). The logfiles can be found in /EXTRAS/ANCILLARY/MRS/LOGFILES and contain information about the level 2 Doppler and Ranging data processing. ODF Level 2 input files: ODF Level 1b files Doppler and Range prediction file Or Orbit reconstructed file Media calibration files The calibrated Doppler files contain observed IFMS Doppler expressed as X-band Doppler or S-band Doppler, residual and detrended X-band or S-band Doppler (computed using the predict file), the detrended differential Doppler. If only one single frequency was used, the differential Doppler will be set to zero. The level 2 ranging file contains the observed Two-Way-Light-Time (TWLT) at X-band or S-band, the calibrated TWLT at X-band or S-band, the TWLT delay at X-band or S-band and the differential TWLT. If only one frequency was used, the differential TWLT is set to zero. Structure of CALIB Directory ---------------------------Please note that the following description lists all possible subfolders. If however there is no data to fill some of these folders they will not be generated. CALIB | |------CALINFO.TXT text description of directory content |----- UPLINK_FREQ_CORRECT | This folder will only be generated if the | uplink frequency in one of the .RAW | files was identified as wrong. | It tells the user which files were | affected and where to find the corrected | Level 2 data files. | |------CLOSED_LOOP | | | |------IFMS | | | | | |----RCL Ranging Calibration Data Files level 1a&1b | | | | | |----FCL Doppler Calibration Data Files level 1a&1b | | | | | |----MET Meteo Files | | | |------DSN | |------OPEN_LOOP | | | |------IFMS | | | |------DSN Files in the CALIB Directory ---------------------------Files in the CALIB directory are: Calibration data files have in principle the same structure as normal data files. But they do not contain scientific data but rather reflect the behaviour of the system. These kind of data is typically recorded at New Norcia once for every tracking before the real measurement took place. For example: range calibration data contain the equipment propagation delay measurements before the tracking pass. Note: if the uplink frequency in one of the .RAW files was identified as wrong the folder UPLINK_FREQ_CORRECT will be generated. It tells the user which files were affected and where to find the corrected Level 2 data files. Closed loop IFMS Calib data level 1a: ------------------------------------These Level 1a data are incoming raw tracking data files obtained from ESA IFMS. All incoming data files will be renamed after the file naming convention format defined in section 4.1 of the MaRS File Naming Convention document [MARSFNC2004] and get a minimal detached label file .LBL. The original file name of the incoming tracking data files will be stored in the according label file as SOURCE_PRODUCT_ID. These files have the file extension .RAW. Closed loop IFMS Calib data level 1b: ------------------------------------IFMS Calib level 1b files are processed from level 1a (raw tracking data) into an edited ASCII formatted file. Three files are generated for each ESA IFMS Level 1a data file: Level 1b IFMS data file (extension .TAB) Level 1b IFMS configuration file (extension .CFG) Level 1b IFMS label file (extension .LBL) The label file contains the description of the .TAB as well as of the .CFG file. Ancillary Data ============== An extensive set of ancillary files is needed for proper analysis and interpretation of the radio data. These are organized in parallel directories and stored approximately chronologically. When a file type is not represented on a CD-WO volume, the corresponding directory has been omitted. Files in the EXTRAS/ANCILLARY Directory ---------------------------Files in the EXTRAS/ANCILLARY directory are: ESOC: Relevant DDS files to describe the observation geometry SPICE: Relevant SPICE Kernels to describe the observation geometry UNI_BW: Relevant PREDICT files from the Uni BW Munich MRS: Level 2 processing logfiles Software ======== Software for parsing, reducing, and analyzing data such as these has been developed at University of Cologne and Stanford University. Because such software must usually operate at the bit-level and is written for a narrow range of platforms, it is not suitable for general distribution. No software is included with this archival data set. Documents ============ The DOCUMENT directory contains the files that provide documentation and supplementary information to assist in understanding and using the data products on the volume. The files evolved as the mission progressed; users should refer to the files on the most recent (highest numbered) archive volume for the most up-to-date information. Files on early volumes may be only 'place-holders.' Structure of the DOCUMENT directory: DOCUMENT | |- DOCINFO.TXT Specifies the content of the | document directory |- MRS_DOC | | | |- M32ESOCL1B_RCL_021202_00.PDF Group delay stability specification | | and measurements at New Norcia. | | | |- M32ESOCL1B_RCL_030522_00.PDF Range calibrations at New Norcia | | and Kourou. | | | |- M32UNBWL1B_RCL_030801_00.PDF Transponder group velocities (in | | german). | | | |- MEX-MRS-IGM-IS-3019.PDF MaRS Data Archive Plan. | | MEX-MRS-IGM-IS-3019.ASC | | | | | |- MEX-MRS-IGM-IS-3016.PDF MaRS File Naming Convention. | | MEX-MRS-IGM-IS-3016.ASC | | | | | |- MEX-MRS-IGM-MA-3008.PDF MaRS User Manual. | | | | | | | |- MARS_OPS_LOGBOOK_04_COM.PDF Status of all planned comissioning | | radio science operations until | | 2004-01-23 | | | |- MEX-MRS-IGM-LI-3028.PDF | | | | List of MaRS Team members. | | | |- MEX_MRS_IGM_DS_3035.PDF | | | | IFMS Doppler Processing and | | Calibration Software | | Documentation: Level 1a to Level 2. | | | |- MEX_MRS_IGM_DS_3036.PDF | | | | IFMS Ranging Processing and | | Calibration Software | | Documentation: Level 1a to Level 2. | | | |- MEX-MRS-IGM-DS-3039.PDF Radio Science Predicted and Recon| | structed Orbit and Planetary Con| | stellation Data: Specifications | | | |- MEX-MRS-IGM-TN-3045.PDF Reference Systems and Techniques | for Simulation and Prediction of | atmospheric and ionospheric | sounding measurements | | |- ESA_DOC | | | |- IFMS-OCCFTP_10_3_1.PDF Documentation of IFMS data format. | | | |- MEX-ESC-ID-5003_FDSICD.PDF File format description of ESOC | | Flight Dynamics files (ancillary | | files). | | | |- MEX-ESC-IF-5003_APPENDIX_C.PDF | | | | Documentation of DDS configuration. | | | |- MEX-ESC-IF-5003_APPENDIX_I.PDF | | | | Definition of XML-schema for the | | data delivery interface. | | | |- MEX-ESC-IF-5003_APPENDIX_H.PDF | | | | Description of content of ESOC | | Flight Dynamics files (ancillary | | files). | | | |- MEX-ESC-IF-5003.PDF Data delivery interface document. | | | |- RO-EST-IF-5010_D15.PDF Specifications of operational | interfaces and procedures. | |- DSN_DOC | | | |- DSN_WEA_FORMAT_TRK_2_24.PDF Specification of DSN weather file. | | | |- DSN_ODF_TRK-2-18.PDF Documentation of Tracking System | | Interfaces and Orbit Data File | | Interface | | | |- DSN_MEDIA_CAL_TRK_2_23.PDF Specifiaction of DSN media | | calibration data. | | | |- JPL_D-16765_RSR.PDF Documentation of RSR data format. | The documents are either in PDF-Format or are text files in ASCII with variable length of characters per line. Each line is delimited with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. Media/Format ============ The archival data set is written on CD-WO media using the WinOn CD Creation Software or Nero Burning Rom. The CD-WO volumes conform to ISO 9660 standards. More general description of radio science data ============================================== Closed-loop and Open-loop data: ================================ There are in principle two different ways to record radio science data: Open-loop and closed-loop data. The CLOSED-LOOP system used a phase-lock loop in the receiver to track the downlink signal, reporting both amplitude and frequency at rates typically of 1-10 times per second. In the OPEN-LOOP system, the signal was simply converted to a baseband frequency range; the entire passband was sampled and recorded for later processing. Typical open-loop sampling rates for MEX were 2000 complex samples per second. CLOSED-LOOP data are efficient for characterizing slowly changing signals; OPEN-LOOP data (because of their much higher volume) are usually used when the signal is very dynamic - such as during an occultation or bistatic radar measurement. The data set includes four primary data types with respect to the two different ground station systems. These systems are on the one hand the ESA ground station in New Norcia, Australia (NNO) and the NASA Deep Space Network (DSN). CLOSED-LOOP data types: ESA: Intermediate Frequency Modulation System (IFMS) Closed-Loop (CL) In this data set file names of data recorded at the New Norcia IFMS closed loop system start with the string 'M32_ICL' IFMS CL consists of Doppler and Ranging data at selected sample rates. The sample rate is usually 1/s. The only exception are occultation data where the sample rate should be 10/s to get a good enough vertical resolution of the atmosphere. Ranging are only recorded for gravity measurements. Thus the IFMS closed loop has three recording systems IFMS 1, IFMS 2 and IFMS 3 The standard_data_product_id in the data label specifies on which system the data was recorded. MaRS measurements are usually done in TWO-WAY configuration: that is an uplink signal goes up (This is usally X-BAND but the uplink signal can also be S-Band) and the ground station receives a dual frequency simultanous and coherent downlink signal. IFMS 1 is configured for the uplink signal. It receives X-Band downlink if uplink was X-Band and S-Band downlink if uplink was S-Band. IFMS 2 acts at backup. IFMS 3 records the second downlink signal. This is usually S-Band. But can also be X-Band when the uplink was S-Band. In addition each Doppler recording system has also two Doppler channels which can record simultanously and act as an additional backup system. Therefor for each IFMS system there should be at a given time two Doppler files and two Auto Gain Control files recorded. The file names of these data contain the string '_D1' or_'D2' for Doppler and '_G1' or '_G2' for Auto Gain control files and they will be on different subfolders within the data directory. See further down the description of the DATA Directory. During the MCO phase only X-Band ranging was possible. Ranging data was nominally recorded on IFMS1. DSN: Orbit Data Files (ODF) ODFs are edited versions of the Tracking and Navigation Files (TNFs) the most primitive (and most voluminous) product of the closed-loop system, specifically targeted to spacecraft navigators and scientists interested in gravity fields. ODF consists of Range and Doppler Data and additional ancillary data. For more information please refer to document [DSNTRK-2-18] in the DOCUMENT/DSN_DOC folder. Open- Loop data types: ESA: Intermediate Frequency Modulation System (IFMS) Open-Loop (OL) During the comissioning phase the IFMS Open-Loop recording system was not implemented, yet. DSN: Radio- Science Receiver (RSR) The Radio Science Receiver (RSR) is a computercontrolled open loop receiver that digitally records a spacecraft signal through the use of an analog to digital converter (ADC) and up to four digital filter sub-channels. The digital samples from each sub-channel are stored to disk in one second records in real time. In near real time the one second records are partitioned and formatted into a sequence of RSR Standard Format Data Units (SFDUs) which are transmitted to the Advanced Multi-Mission Operations System (AMMOS) at the Jet Propulsion Laboratory (JPL). Included in each RSR SFDU are the ancillary data necessary to reconstruct the signal represented by the recorded data samples. Each SFDU is defined here as a single row in a PDS TABLE object; later SFDUs are later rows. The first fields in each row contain the ancillary data (time tags and frequency estimates, for example) that applied while the samples at the end of the record were being collected. The object definitions below explain where the fields are and what the contents represent. Analysis of variations in the amplitude, frequency, and phase of the recorded signals provides information on the ring structure, atmospheric density, magnetic field, and charged particle environment of planets which occult the spacecraft. Variations in the recorded signal can also be used for detection of gravitational waves. For more information please refer to document [JPLD-16765] in the DOCUMENT/DSN_DOC folder.
These data are available on-line from the Planetary Data System (PDS) at:
http://pds-geosciences.wustl.edu/mex/mex-m-mrs-1_2_3-v1/mexmrs_0001/
Questions and comments about this data collection can be directed to: Dr. David R. Williams
Name | Role | Original Affiliation | |
---|---|---|---|
Dr. Martin Paetzold | Data Provider | Universitat zu Koln | paetzold@geo.uni-koeln.de |
Dr. Martin Paetzold | General Contact | Universitat zu Koln | paetzold@geo.uni-koeln.de |