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					       Mission Operations Review

               SECTION 16.x
Aquarius Science Commissioning and
            Acceptance
                  Draft 2
               Prepared by:
       Gary Lagerloef, Aquarius PI
       David Le Vine, Aquarius DPI
             + Science Team
             February 8-10, 2010
            Cordoba, ARGENTINA




                                     Vrsn 1 100105
                                                   Outline



      • Science Commissioning approach

      • Aquarius Commissioning phase timeline

      • Matrix of Critical events and Science Tasks

      • Preliminary Acceptance Criteria

      • Implementation milestones now to ORR

      • Detailed backup slides




Section 01 – Welcome – Agenda – MRB Introduction                          2 of 7
Mission Operations Review                                    February 8-10, 2010
                                           Science Commissioning Approach

       •    Post-launch in-orbit checkout simulation: During the period from launch to
            L+25 days, the science team will compute simulated Tb and σ0 based on
            the final orbit 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)


Section 01 – Welcome – Agenda – MRB Introduction                                              3 of 7
Mission Operations Review                                                        February 8-10, 2010
                                                   Timeline




                                                     To be updated – Dave
                                                     Durham & Ron Boain




Section 01 – Welcome – Agenda – MRB Introduction                                     4 of 7
Mission Operations Review                                               February 8-10, 2010
                                        Aquarius Commissioning Science Tasks




Section 01 – Welcome – Agenda – MRB Introduction                                            5 of 7
Mission Operations Review                                                      February 8-10, 2010
                                                   Preliminary Acceptance Criteria

       •    Engineering Evaluation of the Instrument Complete
             – All internal checks are complete and nominal
             – All instrument L3 requirements are met
       •    Radiometer Specific Criteria
             – Radiometer thermal calibration verified (correction for changes in temperature)
             – Operation is free of gain glitches
             – Antenna Pointing Verified (scenes and transitions where expected)
             – Stable behavior (repeatable signals over constant scenes and crossovers)
             – No detectable interference from Scatterometer or CONAE instruments
             – 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 3rd 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
             – Repeatable behavior
             – σ0 sensitivity to wind speed within expectations for each channel.

Section 01 – Welcome – Agenda – MRB Introduction                                                                                 6 of 7
Mission Operations Review                                                                                           February 8-10, 2010
                                           Implementation Milestones

      •    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.


Section 01 – Welcome – Agenda – MRB Introduction                                                 7 of 7
Mission Operations Review                                                           February 8-10, 2010
                                   Back-up Slides with detail activities
                                     for each commissioning phase
                                              Science Task




Section 01 – Welcome – Agenda – MRB Introduction                                        8 of 7
Mission Operations Review                                                  February 8-10, 2010
                                                   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.

Section 01 – Welcome – Agenda – MRB Introduction                                                 9 of 7
Mission Operations Review                                                           February 8-10, 2010
                                                   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.

Section 01 – Welcome – Agenda – MRB Introduction                                              10 of 7
Mission Operations Review                                                         February 8-10, 2010
                                                   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.



Section 01 – Welcome – Agenda – MRB Introduction                                                   11 of 7
Mission Operations Review                                                              February 8-10, 2010
                                                   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.

Section 01 – Welcome – Agenda – MRB Introduction                                                  12 of 7
Mission Operations Review                                                             February 8-10, 2010
                                                   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.
Section 01 – Welcome – Agenda – MRB Introduction                                                  13 of 7
Mission Operations Review                                                             February 8-10, 2010

				
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