Aquarius Project, Spacecraft, Instrument And Data Processing Status

Aquarius Project, Spacecraft, Instrument andData Processing StatusGene Carl Feldman, Joel Gales, Liang Hong,Norman Kuring, Tommy Owens, Fred Patt,Alicia Scott, John WildingCal-Val Virtual Workshop WebMeeting29-30 January /2013

Outline Instrument Status Spacecraft Status– Star Tracker issue and status Ground System and Data Processing StatusFeldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting2

Aquarius Instrument Summaryprovided by Simon Collins at CONAE PLAR – Nov. 20121-Aquarius mission-mode operation exhibits excellentperformance, meeting all L3 instrument requirements.2-Observatory anomalies have not affected Aquarius instrumentperformance.3-The Aquarius instrument team is supporting routine monitoringof the instrument performance and is involved in instrumentcalibration.Feldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting3

Aquarius Instrument Summaryprovided by Simon Collins at CONAE PLAR – Nov. 2012Feldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting4

Spacecraft StatusOutlineAutonomous Star Tracker (ASTR) 1 and 2Feldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting5

OBSERVABLES FOR THE ASTR ANDAOCS BEHAVIOR (CONTINUED)Feldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting6

OBSERVABLES FOR THE ASTRAND AOCS BEHAVIOR (CONTINUED)Feldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting7

OBSERVABLES FOR ASTR1(CONTINUED)Feldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting8

DISTRIBUTION OF QUALITY INDEXFOR ASTR1 AND ASTR2Feldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting9

LIMITATIONS AND CONSTRAINTS Sub-sampled HKT data: By default, the AOCS data is decimated to one sample every 8seconds. It is possible to decimate some variables to one sample per second. Full ASTR telemetry not available: Only SENSOR STATUS and TELEMETRYSTATUS data blocks are included in the AOCS HKT. Adding additional datawords wouldrequire an AOCS software patch. ASTR CCD map download not available: This would also require an AOCS softwarepatch. Telemetry allocation for one ASTR: Telemetry can be obtained for only one ASTR at atime. AOCS Source Code: INVAP currently has the only copy of the source code and is theonly organization that can develop flight software patches. Flight Software Testing: The SAC-D EM does not include EMs of the ASTRs to supportpatch validation.Feldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting10

OPERATIONAL MITIGATIONSTRATEGIESMitigation Plan Rev. A: Disable automatic re-promotion of ASTR AAD mode by FDIR for 20 minutesstarting just before Moon intrusion (recommended by NASA SME M. Vess). Implemented starting 9 August 2012.Mitigation Plan Rev B: Command ASTR to STB mode for 20 minutes starting just before Moon intrusion. Implemented starting 7 October 2012.Mitigation Plan Rev C: Disable use of ASTR1 by AOCS for 49 minutes starting just before Moon intrusion. Implemented starting 19 November 2012.Mitigation Plan D:INVAP delivered an analysis of the ASTR-driven AOCS SHO transitions and aproposed solution.This proposal is currently under discussion between CONAE,INVAP and NASA and may be implemented next week.Feldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting11

Aquarius Project StatusPath Forward on ASTR situationAs a result of consultations with the Project Office and the recommendations of the StandingReview Board at the SAC-D PLAR, CONAE has requested that NASA convene a group ofexperts from all organizations involved in the Project to achieve the following objectives:1-A near-term operational strategy for CONAE to implement in order to mitigate theimpact of the performance issues, specifically to minimize the degradation of theAquarius and SAC-D instrument science data.2-An understanding of the apparent change in the performance of ASTR1 sincethe start of the mission.3-An understanding of the as-launched AOCS software, specifically in theimplementation and quality control of the ASTR data;4-An understanding of the performance of ASTR2 during the period when it waspowered on, which was observed to be significantly worse than ASTR1.5-A long-term resolution, e.g., AOCS parameter changes or software patches, toaddress the ASTR and/or AOCS issues.The focus of the Team will be on objectives 2 through 5.Feldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting12

Status Summary The Aquarius Ground Segment -- both systems and personnel -- areworking well, and there are no significant issues. The end-to-end process of Aquarius data collection -- planning,scheduling, downlink, acquisition -- has worked as designed sincelaunch. Not a single minute of Aquarius data has been lost sincepower-on due to either spacecra', instrument or ground systemanomalies demonstrating robustness of the downlink strategy. Atthis time, no spacecra'-related maneuver or issue has madeAquarius exceed its data loss requirement (8% per month) The operations interfaces with CONAE have matured significantlysince Aquarius PLAR. All planning product deliveries, verificationsand CUSS/CODS products are now routine with only occasionalissues - all of which have been quickly and effectively resolved.Feldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting13

Status Summary The Aquarius and SAC-D Status and Housekeeping Telemetry web-basedanalysis pages are widely used by all teams and have providedcomprehensive, critical and timely information to help identify manyissues that have arisen since launch. As our understanding of theinstrument and spacecra' has improved, the capabilities of these toolshave been expanded. GS team holds quarterly telemetry workshops withthe instrument team. CONAE FOT and ACCS are joint participants in the weekly issue/anomalyreview process. Other teams (e.g., Aquarius instrument, SDI) invited toparticipate. FOT and ACCS function as a unified team in this area. All documents are under CM. Aquarius GS documents are signed off.Joint CONAE/Aquarius operations documents are complete. Multiple algorithm updates (V1.2 to 2.0) have been implemented andalgorithm update verification process has been refined since launch.Complete mission reprocessing takes less than 1 day and products areimmediately available to the science team and PO.DAAC.Feldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting14

Aquarius WebsitesFeldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting15

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Aquarius Level-1-2 Data sFeldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting26

Aquarius Level-1-2 Data sFeldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting27

Aquarius Level-1-2 Data sFeldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting28

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Aquarius SeasonalSea Surface Salinity (V1.3.9)Summer 2011Spring 2012Feldman et al – Project StatusAquarius Cal/Val WorkshopAutumn 2011Winter 2011/2012Summer 2012Autumn 201229-30 JanuaryNASA WebMeeting30

Aquarius One YearSea Surface SalinityFeldman et al – Project StatusAquarius Cal/Val Workshop29-30 JanuaryNASA WebMeeting31

NASA WebMeeting Feldman et al - Project Status Aquarius Cal/Val Workshop Aquarius Instrument Summary provided by Simon Collins at CONAE PLAR - Nov. 2012 1- Aquarius mission-mode operation exhibits excellent performance, meeting all L3 instrument requirements. 2- Observatory anomalies have not affected Aquarius instrument performance.