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Mission Operations Review 08 – 10 February 2009 Falda del Carmen, Córdoba, ARGENTINA SECTION 16 Aquarius Launch and Commissioning Operations Ron Boain, System Engineer Dalia McWatters, Aquarius Instrument System Engineer Gary Lagerloef, Aquarius Principal Investigator
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2 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Agenda Purpose of Instrument Commissioning Commissioning Ground-rules Decision Authority During Commissioning Aquarius Turn-on Precursors Nominal Commissioning Steps and Details Instrument Engineering Team Activities Aquarius Team Deployment and Needs Command Sequences Science Commissioning Approach Science Implementation Milestones Aquarius/SAC-D Anomaly Resolution Process Transition from Commissioning to Routine Ops Summary
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3 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie The Aquarius instrument Commissioning mission phase: – The execution of an ordered set of activities to transition the instrument from its non-operational state at launch to a fully powered operational state ready to begin the routine science data collection – The execution of an ordered set of science commissioning activities to assess instrument performance and readiness to proceed with routine science data collection Commissioning nominally begins 25-days after launch and is scheduled to last through L+35 days – Delays in the completion of Service Platform commissioning will delay the start of Aquarius Instrument commissioning day for day At the completion of commissioning, the project will conduct the Post-Launch Assessment Review (PLAR) to determine readiness to begin with routine science data collection and the transition to Phase E PLAR success criteria include: – S/P and instrument performances are understood and agree with predictions – Mission operations are functioning adequately to meet the mission's future needs – Anomalies satisfactorily dispositioned Purpose of Instrument Commissioning
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4 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Commissioning Ground Rules The primary commanding and controlling of the instrument during commissioning will be done from the CONAE MOC in Cordoba – Instrument team located there throughout the commissioning phase – Instrument team will have access to the S/P operations team and will use the same S/W diagnostic tools as used during I&T – Instrument procedures are tailored to systematically start and check the instrument's health and performance during commissioning A shadow capability for commanding and controlling the instrument will exist at the Aquarius Ground System at GSFC – Aquarius GS focus is on instrument activities and its interactions with the S/P For the Aquarius instrument, initial power-on and reflector deployment are considered critical to the instrument's successful commissioning and are therefore scheduled to occur with tracking station visibility for real-time telemetry and commanding – The timing of these events will depend on ground station coverage – Coverage times will be confirmed/updated by the FOT following confirmation of the actual operational orbit
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5 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Decision Authority During Commissioning Decision authority remains with the development project organization (JPL) throughout the commissioning phase Instrument commissioning activities are reviewed and approved by the Project staff prior to launch; execution of instrument commission is carried out by the Instrument Team, lead by the Aquarius ATLO Manager Credible anomalies will have verified contingency procedures available for execution Departures from the nominal operations procedures require Project Manager's approval to be implement
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6 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius Operations Team Interfaces (Commissioning)
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7 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius Turn-on Precursors “Precursors” are activities that must be performed by the service platform, the ground system, and/or the launch vehicle prior to the start of Instrument commissioning activities Precursor activities: – Observatory launched and safely separated – S/P has completed its commissioning and checkout and S/P subsystems are operating nominally Post-launch anomalies affecting critical S/P functions, if any, have been resolved – The Observatory has removed launch injection errors and has acquired the operational orbit (sun-synchronous, frozen, MLT = 18:00 hrs) – ROSA radio occultation antennae have been deployed – Updated list of NEN tracking contact opportunities has been determined per updates to the post-launch orbit parameters Tracking pass opportunities coordinated with instrument commissioning activities – S/P attitude and thermal stability around the orbit has been characterized, including thermal responses with heaters activated – S/P ready to assume a safe-hold state during reflector deployment
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8 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Early Orbit and Commissioning C-8
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9 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius State and State Changes per Mission Timeline Pre-Launch – Powered-off Launch – Powered-off – Fairing Separation: Instrument Survival Heaters powered-on Service Platform Commissioning and Checkout – Instrument Survival Heaters powered-on Orbit Corrections Maneuvers – Instrument Survival Heaters powered-on Aquarius Commissioning – Commissioning activities Step-by-step power-on Reflector deployment Performance evaluated SAC-D Instrument Commissioning – Aquarius Instrument evaluation of EMI while collecting science data
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10 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius instrument data paths Aquarius Instrument 1553 ground commands, And GPS time 1553 HKT every 8 sec, + Aq software messages (and Watchdog response) 4 Mbps data+clock Science data and same 1553 HKT (but every 1.44 sec, and not software messages) DRAM 18 hours of Aq sci data S/P Mass Memory S/P C&DH X-band Tx S-band Rx S-band Tx Real-time Channel interleave stored Cmds executed immediately (patch cmds stored till “install” step) Cmd time tag processed
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11 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius Instrument Commissioning Timeline
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12 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius Instrument Commissioning Steps (1/7) Day 1: (Instrument step/associated station pass required to complete the step) Verify S/P configuration parameters for Aquarius S-band, 5 minutes min. Power on ICDS and verify health S-band + X-band, 9 minutes min. Configure ATC controller S-band + X-band, 8 minutes min. Power on Radiometer DPU and verify health S-band 7 minutes min And X band 4 minutes min, within 15 to 30 minutes of previous S-band pass to confirm HKTs do not indicate alarm conditions. Turn on operational deployment heaters auto-temp control in preparation for deployment X-band, 4 minutes min. Aquarius requests downlink for all X-band S/P downlinks over every X- band station pass.
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13 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius Instrument Commissioning Steps (2/7) Day 2: (Instrument step/associated station pass required to complete the step) Verify UDM and reflector temps are within operating range for deployment multiple S-band passes Power off Radiometer DPU and Deploy reflector (sepnuts) S-band, 9 minutes min. Verify successful deployment, ICDS and S/P health X band 4 minutes min., within 15 to 30 minutes of previous S-band pass to confirm HKTs do not indicate alarm conditions. Verify LDM temperatures are within operating range for deployment multiple S-band passes Deploy boom (pinpuller) S-band, 12 minutes min. Verify successful deployment, ICDS and S/P health X band, 4 minutes min., within 15 to 30 minutes of previous S-band pass Power off deployment operational heaters S-band, 5 minutes min.
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14 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius Instrument Commissioning Steps (3/7) Day 3: (Instrument step/associated station pass required to complete the step) Power on DPU S-band, 9 minutes min verify DPU health S-band + X-band, 11 minutes min., within 15 to 30 minutes of previous S- band pass to confirm HKTs do not indicate alarm conditions. Power on ATC and RBE replacement heaters to begin warm up towards set-point S-band, 10 minutes min. Upload patch R5-19b scat component S-band, 5 minutes min. Verify Scat component is ready to install X-band, 4 minutes min. Install scat component and upload R5-19b science component S-band, 5 minutes min. Verify science component is ready to install X-band, 4 minutes min. Install science component, upload patch R5-19a (DPU) S-band, 5 minutes min. Verify R5-19a is ready to install X-band, 4 minutes min.
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15 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius Instrument Commissioning Steps (4/7) Day 4: (Instrument step/associated station pass required to complete the step) Install patch R5-19a and assess RBE temperature S-band + X-band, 12 minutes min. Turn off RBE replacement heaters and power on all Radiometer RF strings S-band, 12 minutes min. Assess Radiometer health S-band + X-band, 8 minutes min., within 15 to 30 minutes of previous S-band pass to confirm HKTs do not indicate alarm conditions Once radiometer internal temps stabilized within 0.2 deg. per orbit, run for 3 orbits. Then evaluate radiometer internal calibration and run the science algorithm for crude calibration and produce ocean brightness temp. Multiple S, and X band passes
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16 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius Instrument Commissioning Steps (5/7) Day 5: (Instrument step/associated station pass required to complete the step) Setup Scatterometer operating parameters S-band, 5 minutes min. T urn off Scat replacement heaters and verify radiometer is ready for scat power on S-band + X-band, 11 minutes min. Power on Scatterometer and sequence to receive only mode S-band, 12 minutes min. Assess Scatterometer health S-band + X-band, 8 minutes min., within 15 to 30 minutes of previous S-band pass to confirm HKTs do not indicate alarm conditions Dwell for 3 orbits to assess scat receive only stability and performance as well as RFI environment. Multiple S and X band passes
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17 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius Instrument Commissioning Steps (6/7) Day 6: (Instrument step/associated station pass required to complete the step) Power on Scatterometer SSPA S-band, 5 minutes min. Verify SSPA health, no effect on radiometer and no-multipaction constraint S-band + X-band, 4 minutes min. Transmit on Beam 3 only S-band, 12 minutes min. Assess instrument health S-band, 10 minutes min. Assess scat performance and run the roughness algorithm. Evaluate radiometer internal calibration and run the science algorithm for crude calibration and produce ocean brightness temp. X-band, 4 minutes min.
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18 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius Instrument Commissioning Steps (7/7) Day 7: (Instrument step/associated station pass required to complete the step) Assess instrument performance, functionality and health in preparation for mission mode Multiple S and X band passes Day 8: Transmit on all beams S band + X band, 9 minutes min. Assess instrument health Several S and X band passes at intervals of 15 to 30 minutes from start of transmit Day 9-10: Verify Scat loopback level and echo level for various returns from the earth surface. Confirm receive window position and duration is correct now for all beams. Multiple S and X band passes Begin assessment of instrument performance readiness for commissioning (temperature stability, RFI, ocean measurements, calibration). Multiple S and X band passes. Still need every ETC and Matera pass for maximum efficiency in instrument health performance assessment. During this time, engineering checkout of the instrument is complete. Scatterometer and Radiometer engineers fly to GSFC to join the science team in continuing calibration and performance assessments, as well as RF interference with other SAC-D instruments as they are turned on.
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19 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Instrument Engineering Team Activities During Commissioning (1/2) The On-Orbit-Checkout Procedure includes verification of the instrument status from real-time-telemetry, played back stored telemetry and software messages, and high rate science data The instrument team will interact with the S/P flight operations team at the CONAE MOC for command verification and re-planning The instrument team will monitor and assess instrument health and performance from the CONAE MOC. The GSFC ops team will monitor instrument health and process high rate data in preparation for post commissioning The science team at GSFC will support instrument early performance assessments during commissioning The Aquarius Test Bed will be operational and available at GSFC to be used for verification of unplanned command sequences and anomaly resolution
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20 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Instrument Engineering Team Activities During Commissioning (2/2)
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21 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius Simulation Exercises activityrequired participants Aquarius on orbit checkout simulation with the S/P EM Aq instr team, Aq ops team, Veng, INVAP S/P team, Conae on orbit anomaly process review (after reading the document) Aq instr team, Aq ops team, Veng, INVAP S/P team, Conae, Aq project, Aq GS team, Aq science team procecdure review for S/P anomaly that affects Aquarius * Aq instr team, Aq ops team, Veng, INVAP S/P team, Conae procecdure review for Aq anomaly that affects S/P * Aq instr team, Aq ops team, Veng, INVAP S/P team, Conae * other anomalies of this type can be reviewed as procedure documents by email On-Orbit-Checkout Procedure was simulated with instrument team and GSFC ops team at JPL on Oct 2009, with the test bed. Additional simulation exercises planned:
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22 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius Team Deployment & Needs Thermal Engineer at CONAE MOC in Cordoba 4-days prior to launch –Monitors the Instrument’s thermal state and verifies survival temperatures from launch to start of commissioning Aquarius Team (9 members) shows up at MOC 4-days before the start of Aquarius commissioning –Allows time for Team to acclimate and setup GSE Aquarius Team facility needs: –Access to Telemetry viewer –Access to X-band stored HKT –Access to X-band high rate Aquarius data –Accommodations for three computers to monitor data Aquarius Ground System team at GSFC: –Verifying data interfaces with Cordoba, and other stations, in parallel with instrument team effort at Cordoba
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23 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie The Aquarius instrument test-bed The Aquarius instrument test-bed consists of the breadboard ICDS running flight software with functional flight like command, telemetry and high rate data interfaces. Flight like format and functionality: – 1553 commands – 1553 telemetry – High rate science data – Can test command sequences are accepted – Can test flight software patches The Aquarius Test Bed has successfully passed acceptance test (at JPL) and is ready for shipment to GSFC after launch. It will then be integrated with the high rate EGSE from VAFB.
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24 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius Test-bed block diagram
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25 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Test-bed Additional functionality In case of instrument anomaly which involves instrument functions and hardware which are not included with the Test-Bed: – The subject matter experts (subsystem Cog Es for Scatterometer, Radiometer, Power Distribution System, Active Thermal Control, Antenna, software) will initially setup the appropriate tests in their own labs (JPL and GSFC) using breadboard hardware. – If necessary, that hardware can then be integrated with the Aquarius Test-bed (but may take several weeks and TBD $ to implement). – The breadboards of the ICDS, Scatterometer, Radiometer and APDU had already been successfully tested together prior to instrument CDR.
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26 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius command sequences list
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27 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Post-launch in-orbit checkout simulation: During the period from launch to L+25 days, the science team will compute simulated Tb and σ 0 based on the final orbit after maneuvers (Science Task 1) – These data will provide “Expected Values” for each beam along-track to compare quantitatively with observations for both the engineering and science acceptance analyses The science team will carry out an analysis sequence (Science Tasks 2-7) at each stage of the instrument turn-on sequence Acceptance criteria are limited: – The timeline only allows for one 7-day cycle after the instrument is fully turned on – Assess whether the data are “as expected” in qualitative terms and the sensor is “calibrate-able” – Gross geographical and geophysical features are as expected, biases can be removed, stability is reasonable, polarization differences are appropriate, etc. (details below) Science Commissioning Approach
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28 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius Commissioning Science Tasks
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29 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Engineering Evaluation of the Instrument Complete – Internal checks are complete and nominal (temperature, voltage, currents, telemetry) – Instrument L3 requirements are met Antenna deployment is nominal Thermal control system nominal Radiometer Specific Criteria – Radiometer internal performance nominal (consistent with observations pre-launch) Gain, NEDT, Counts Level, Noise Diode Ratios – Radiometer gain stability nominal at the operational thermal set point – Antenna Pointing Verified (scenes and transitions where expected) – Interference from Scatterometer or other SAC-D instruments within specifications – Predictable Science Response (consistent with simulations) Land - ocean features evident in radiometer brightness temperature (Tb) both in contrast and location; Relative polarization levels (V compared to H) for each beam are consistent with the emissivity model; Relative levels of Tb among beams is consistent with emissivity model (e.g. V-pol signal increasing and H-pol decreasing with increased incidence angle); The 3 rd Stokes signal consistent with expectation (small signal varying with Faraday rotation); – Reasonable initial “first-look” 7-day salinity map consistent with climatology Scatterometer Specific Criteria – Receiver gain and receiver noise within expected range – Transmit power-receive gain product (loopback) within expected range – Losses of cables between RFE and OMT are stable (inferred from CND; applies to radiometer) – Antenna pointing stable (land-water signals as expected and repeatable) – σ 0 of ocean and land within expected range for each beam. Preliminary Acceptance Criteria
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30 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie 1 March 2010: Science simulator – CY2007 Level 2 (swath) and Level 3 (gridded map) files released 9-11 March 2010: Aquarius algorithm science team workshop, Santa Rosa, CA 30 March 2010 until Launch: – Operational simulator generates daily files, – Analysis and evaluation by science team 1 April – to – ORR: – Science team develops and tests Aquarius commissioning phase analysis tools. – Use simulators and tools to develop and test case studies, anomalies and rehearsals. 19-21 July 2010: Aquarius/SAC-D Science Team meeting, Seattle ORR: Final commissioning phase plan; analysis tools tested and ready. Science Implementation Milestones
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31 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Aquarius/SAC-D Anomaly Resolution Process
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32 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Transition from Commissioning to Routine Ops Following a successful Post-Launch Assessment Review (PLAR), Aquarius management responsibility will transfer from the JPL development office to the GSFC operations office A preliminary plan has been written and is in review that addresses activities required for the transition: – Summary of instrument and science commissioning operations activities and criteria for instrument certification – Operations organization criteria for certification – Management of fiscal resources for operations during Phase E – Coordination of Aquarius instrument operations with the SAC-D Mission Operations Center (MOC) administrated by CONAE
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33 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Actions Needed for a Successful Transition Organizational structure established and functional at GSFC to support Aquarius instrument operations Instrument operational parameters for maintaining instrument health and safety and parameter out-of-limit conditions defined and documented Aquarius instrument commands and scripts for use operating the Observatory identified, tested, and documented (i.e., under configuration control) Mission level test and training complete Ground System operations personnel trained and certified for operations of the Aquarius instrument Aquarius instrument testbed and all operational aspects of the testbed, e.g., documentation and personnel training, provided to the Aquarius Ground System at GSFC Successful completion of a post-launch test plan as agreed to by the Aquarius managers and the Principal Investigator Mechanism in place for providing contingency support by key instrument engineering personnel at JPL NASA transfers budget and resource authority from JPL to GSFC
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34 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Summary A commissioning plan exists which outlines the systematic steps and timeline for the Aquarius instrument after launch Aquarius instrument team staffing and their needs have been identified in order to support the commissioning Command sequences to be used during system test will verify their readiness for use during flight Science has defined its expectation for the state and performance of the instrument going into routine science data collection An anomaly resolution process applicable to the commissioning and routine science mission phases has been defined and will be tested during mission simulations Instrument and operations transition criteria have been identified but will need NASA Headquarters, JPL and GSFC approval A transition plan to smoothly transfer management responsibility and control of the Aquarius effort has been written and will be approved before launch
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35 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Back-up Slides with detail activities for each commissioning phase Science Task
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36 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Science Task 1 Task: Generate simulated data for radiometer (TA) and scatterometer (sigma0); Simulation reflects actual orbit and spacecraft attitude; 7-10 days of data simulated; Prepared 5 days prior to instrument turn-on (for use by engineering team) and updated as necessary. Available to engineering team on location at MOC. Objectives: Engineering: Simulated TA and sigma0 for the engineering team to use during on-orbit check out to judge reasonableness of the actual measured signals; Science: A reference signal for use by science team to begin evaluation of the science quality of the first signals. Representative Roles and Responsibilities: Wentz: Radiometer TA simulations; Yueh: Scatterometer Sigma0 simulations.
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37 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Science Task 2 Task: Examine radiometer data to judge whether or not the radiometer data is reasonable Begins on day 4 after radiometer is completely turned on; Continues through end of commissioning (PLAR); Initially, thermal stability may not be ideal. Objectives: Collect reference data prior to the turn on of other instruments (Scat and CONAE) as baseline to judge interference; Collect data to assess acceptance criteria for PLAR; Representative Roles and Responsibilities: Wentz: Examine TA to asses pointing accuracy; Le Vine: Evaluate T3 and retrieved Faraday rotation; Ruf: Evaluate RFI environment and detection algorithm; Brown: Compare histograms of actual and model TB; Lagerloef: Start processing AVDS matchups.
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38 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Science Tasks 3 - 5 Task: Examine scatterometer data during turn on of the instrument Days 5-7 during 3-day turn-on sequence for the scatterometer; Radiometer is on and collecting data. Objectives: Examine radiometer data for evidence of scatterometer interference (engineering team will also be looking at raw data); Examine scatterometer data for reasonable behavior. Representative Roles and Responsibilities Yueh and scatterometer engineering team: Examine loopback power, noise only measurements and echo power; Yueh: Analyze correlation of sigma0 with winds (NCEP). Radiometer team (Wentz, Le Vine, Brown, others): Examine radiometer data before and after scatterometer turn-on for evidence of interference.
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39 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Science Task 6 Task: Examine Aquarius instrument data (scatterometer and radiometer) for nominal behavior Days 8-10 after both instruments are turned on completely; First nominal operation; Objectives: Continue with radiometer science data evaluation begun in Task 2; Begin evaluation of scatterometer data in nominal mode; First look at instrument stability; Comparison of data at reference sites and at cross-over points. Representative Roles and Responsibilities Ruf: Collect data for first look at “vicarious” calibration; Le Vine: Compare Faraday rotation retrieved from T3 with in situ (ground sounders) truth; Wentz: Pointing accuracy and effect of Sun; Yueh: First look at roughness correction for radiometer.
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40 of 7 February 8-10, 2010 Section 16 – AQ Launch & Commissioning Ops Mission Operations Revie Science Task 7 Task: Nominal Aquarius instrument operation (radiometer and scatterometer) and CONAE instrument turn on; Day 11 - TBD: Nominal Aquarius operation CONAE instruments start turn on. Science team activities continue from previous tasks. Objectives: Examine radiometer data for evidence of interference from CONAE instruments; Generate first 7-day global map of SSS Continue to collect data to assess acceptance criteria for PLAR. Representative Roles and Responsibilities Science Team: Coordinate data collection with CONAE instrument turn-on to search for evidence of interference; Lagerloef: Generate reference SSS map from Argo data and de- bias Aquarius SSS output; Yueh: Roughness correction and correlation of sigma0 with NCEP and other sources of data on winds.
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