Data Set Information
DATA_SET_NAME MSL MARS ROVER ENV MONITORING STATION 3 TELRDR V1.0
DATA_SET_ID MSL-M-REMS-3-TELRDR-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : The REMS instrument is a meteorological package designed to provide measurements of air and ground temperatures, wind speed and direction, pressure, humidity and ultraviolet radiation. The REMS TELRDR data set contains processed REMS data where the counts given by the analog/digital converters from the instrument sensors have been converted to their corresponding thermal and electrical values, taking into account calibration information, gains and other possible electrical altering factors (such as the ASIC temperature). All these data can be found in the REMS EDR data set with the exception of calibration information. Whenever it is possible, temperatures instead of resistances are given, since conversion between them is straightforward. This implies that air temperatures from the Air Temperature Sensor are already present at this level. Data is a time ordered sequence of rows organized into a table, taken at a maximum resolution of one second. Each data product contains one sol worth of activity and has information from all sensors. This data set represents the first intermediate processing step to calculate environmental magnitudes. No external models or corrections have been applied. Parameters : The information included for each sensor is the following: - Wind Sensor: convective powers and hot temperatures from the 12 transducers for each boom. Cold temperatures from the 3 boards in each boom where the transducers are allocated. - Ground Temperature Sensor: temperatures and voltages from the 3 thermophiles. Calibration plate temperature. - Air Temperature Sensor: temperatures measured by each one of the PT1000 sensors on each boom. There is no sensor at the base of the rod at boom 1, so for that boom the third temperature is the mean of the three thermopiles temperatures. - Ultraviolet Sensor: photodiodes output currents and sensor operating temperature. - Humidity Sensor: sensor capacities for each of the 8 channels. - Pressure Sensor: sensor capacities for each of the 8 channels. Sampling is at 1Hz maximum, with a baseline operation of 5 minutes every hour. Additional measurements can be taken on an on-demand basis beyond those hourly observations. For these additional measurements, and besides tactical day to day conditions and resources, there is a general pattern that covers selected hours of the day built by the scientific team during operations. That pattern is shifted from sol to sol to cover the whole 24 hours after a few sols. Additionally, extended measurements can also be triggered automatically if event mode is activated, in which case the REMS computer will decide or not to continue measuring after the regular cadence, by comparing the previous measurements with the expected trend. The objective is to capture any ongoing transitory atmospheric event. During the first 72 sols, for each 5 minute block, the following measurement strategy was used: Wind Sensor is switched off for 60 seconds, then it is switched on for 235 seconds, and then it is switched off again for the final 5 seconds. The rest of the sensors are switched on all the time. This strategy was based on results obtained during pre-flight testing. However, after evaluating flight data, it was determined that this strategy was not necessary, so from sol 73 onwards all sensors are switched on for each 5 minute block. From sol 793 onwards, a new measurement strategy for Humidity Sensor was introduced. It is called HS HRIM (Humidity Sensor High Resolution Interval Mode) and is only used on selected one-hour long observations. This new strategy intends to minimize heating of the Humidity Sensor, and consists of alternately switching on and off the sensor at periodic intervals. At the same time, Boom 2 is switched off, which means that there are no Wind Sensor and Air Temperature Sensor measurements. Processing : Processing starts with the generation of the REMS EDRs. The REMS EDR data products are generated by the MIPL (Multimission Image Processing Laboratory) at JPL, under the OPGS, using the telemetry processing software called MSLEdrGen. This software will convert the binary data received from telemetry to ASCII. EDRs will then be retrieved at Centro de Astrobiologia (INTA-CSIC) using the File Exchange Interface (FEI). EDR data products have a first automatic process using calibration data. The result of this is the TELRDR data set, which contains electrical magnitudes and thermal data. In parallel, using ancillary data provided by JPL (such as rover location, sun position) the ADRs (Ancillary Data Records) are generated. EDRs, TELRDRs, ADRs, and calibration data are processed together to obtain the ENVRDRs. The level of processing of the ENVRDRs includes environmental magnitudes with minimal corrections (mainly based on the degradation of the sensors). Finally, applying models developed by the REMS team and refining them with the confidence levels, the MODRDR data set is created. In the process to convert EDRs to TELRDR, the procedure to calculate the electrical magnitudes from counts varies from sensor to sensor. These counts are the result of a digitization from an Analog/Digital Converter, so the reverse process is done using data obtained during the calibration of the instrument. These data are included in the CALIB directory. Three of the sensors (Wind Sensor, Ground Temperature Sensor and the Air Temperature Sensor) are handled through an ASIC (Application-Specific Integrated Circuit), and are affected by its temperature and power conditions. These ASIC values and their effects are included in the processing in addition to the digital-analogical conversion. ASIC information is also included in the EDRs. Finally, with a one to one time match between EDRs and TELRDRs, the resulting data is integrated into a single table. Data : Each REMS TELRDR product in the data set is an ASCII table containing all sensors data, accompanied by a detached PDS label. Each row contains an acquisition session, while columns contain the sensors values. This makes it easy to load the data products in a spreadsheet program or in a database. Columns with related information are placed together, in the following order: time references (REMS clock, LMST and LTST), Wind Sensor, Ground Temperature Sensor, Air Temperature Sensor, Ultraviolet Sensor, Humidity Sensor and Pressure Sensor. REMS clock is synced with the spacecraft clock (SCLK) with a maximum deviation of 30 sg. LTST is given with respect to the rover position, in contrast with LTST given in REMS EDR labels and in other MSL data, which is given with respect to landing site. Columns are delimited by commas and are of fixed length. Rows are time ordered and are separated by a carriage return/line feed. Each table contains a sol of measurements. Data may be set to UNK if their value is not known and it will never be (such as saturation, or a specific sensor switched off during acquisition). They may also be set to NULL if their value is not known at the moment of the release of the data set, but it is expected to be known in a future release. Ancillary Data : The ancillary data used in the generation of this data set is laboratory calibration data, all of which can be found in the CALIB directory. Calibration files are in plain ASCII text format. They are structured in a PDS label-like structure, with the form DATA : VALUE, each value taking up one line. A file per sensor is provided. The following ancillary data are needed to generate higher level data and to estimate its quality: Laboratory calibration data Solar azimuth and elevation Rover azimuth, elevation, altitude, pitch, yaw and roll Rover speed Masthead azimuth and elevation Rover temperatures UV sensor dust attenuation These data can be found as part of the REMS ADR records. Software : No software is provided in this data set. The RDR tables are simple ASCII files that can be displayed on UNIX, Macintosh, and PC platforms with common software.
DATA_SET_RELEASE_DATE 2019-12-05T00:00:00.000Z
START_TIME 2012-08-07T04:04:38.536Z
STOP_TIME 2019-07-31T07:11:24.136Z
MISSION_NAME MARS SCIENCE LABORATORY
MISSION_START_DATE 2003-10-01T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME MARS
TARGET_TYPE PLANET
INSTRUMENT_HOST_ID MSL
INSTRUMENT_NAME ROVER ENVIRONMENTAL MONITORING STATION
INSTRUMENT_ID REMS
INSTRUMENT_TYPE ENVIRONMENTAL STATION
NODE_NAME Planetary Atmospheres
ARCHIVE_STATUS LOCALLY ARCHIVED - ACCUMULATING
CONFIDENCE_LEVEL_NOTE Confidence Level Overview : The data presented in this data set has been processed by applying laboratory calibration data and formulas derived from the REMS electronic design. Accuracy of these data is the correspondent to that one of the calibration process, although extensive tests in representative conditions have been done to ensure its reliability. Wind Sensor data of boards 2 and 3 in boom 1 are not provided as they were damaged during landing. In addition, the following Wind Sensor boards in boom 2 are not operative starting on given sols: - Board 1, dice 1: since sol 854 - Board 2: since sol 1485 - Board 3: since sol 1491 - Board 1: since sol 1504 Review : The REMS RDRs were reviewed internally by the REMS team prior to release to the PDS. PDS also performed an external peer review of the REMS RDRs. Data Coverage and Quality : Data reported are processed data derived from raw data received during nominal REMS operations. Each TELRDRs table provides sensors values measured during one sol, which are dependent of pre-flight calibration data. Sensors switched off at the time of measurement are set to UNK. Saturated Wind Sensor data or those correspondent to damaged boards are set to UNK. When the Pressure Sensor is acquiring in high resolution mode, the channels not in use are set to UNK. Limitations : The major limitation of this data set is that most of the data is at the electrical level. Missing information from Wind Sensor in the boom 1 makes it difficult to estimate wind data when it is coming from behind the rover mast in the boom 2 direction.
CITATION_DESCRIPTION Gomez-Elvira, J., Mars Science Laboratory Rover Environmental Monitoring Station RDR Data V1.0, MSL-M-REMS-3-TELEDR-V1.0, NASA Planetary Data System, 2013.
ABSTRACT_TEXT Data taken by the sensors of the Rover Environmental Monitoring Station (REMS) aboard the Mars Science Laboratory, in electrical and thermal units.
PRODUCER_FULL_NAME JAVIER GOMEZ-ELVIRA
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