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X-ray Wide Field Imager

X-ray Wide Field Imager. Mission Operations Deborah K napp 16-20 April, 2012. Topics. Study Requirements – Mission Operations Customer Requirements Mission Overview Mission Timeline Mission Operations Overview Design Requirements & Assumptions Ground System Functional Architecture

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X-ray Wide Field Imager

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  1. X-ray Wide Field Imager Mission Operations Deborah Knapp 16-20 April, 2012

  2. Topics • Study Requirements – Mission Operations • Customer Requirements • Mission Overview • Mission Timeline • Mission Operations Overview • Design Requirements & Assumptions • Ground System Functional Architecture • MOC Architecture (typical) • Technology Required • Cost Basis of Estimate • Mission Schedule • Staffing Periods Used for Costing • Cost Summary • Risk/Issues/Concerns • Additional Trades • Acronyms

  3. Study Requirements – Mission Operations • Provide a Concept of Operations • Provide a Ground System Architecture diagram • Provide the Mission Operations costs

  4. Customer Requirements • Launch date: 1/1/2021 • Mission Life: 3 yrs Science required, 5 yrs goal • L2 orbit • Max data volume • 5.51 Gbits/day Nominal • 41.94 Gbits/day High Rate • Maneuver to disposal orbit at end of life • Class B mission

  5. Mission Overview • X-ray telescope • X-ray survey of sky and of selected targets

  6. Mission Overview

  7. Mission Timeline Launch 1/1/2021 L2 Insertion Disposal Prime Mission 36 - 60 months Mission Closeout Cruise 100 days 1 month Checkout (8x5 ops) Nominal Operations (4x5 ops)

  8. Mission Operations Overview • ON ORBIT OPERATIONS • Mission is planned for Earth-Sun L2 and will run autonomously based on weekly uploads for targeting. A pointed mission that observes a target in one of two instrument modes (full frame or window) for a set length of time and then moves to next target in list. • Data are accumulated and sent to ground once per day. Data are relative positions, time and amplitude of detected X-ray photons along with corresponding S/C systems data needed to reconstruct the pointing history of the observatory. • A separate S/C ADCScontrols the actual spacecraft pointing and control, the instrument star trackers provide the pointing knowledge • GROUND OPERATIONS • MOC plans the science mission timeline, generates the S/C uploads and monitors the mission. • Daily health and safety contacts with recovery procedures in place if needed • Pipeline data processing at SOC and distribution to observers and archive

  9. Design Requirements & Assumptions • Mission Operation Control (MOC): • Provides “standard” set of functional components to support Mission Operations (e.g., S/C commanding, mission planning/scheduling, and RT TLM monitoring, HK trending and analysis). • Provides level zero processing (LZP) • Level 0 Products: Time-ordered, quality annotated data sets produced for each contact • Provides voice communications between the MOC & Science Operations Center for coordination • Space-Ground contact profile • DSN 34 meter sites • TDRSS for Critical Support Operations • Spacecraft data rates via DSN: • 2 kbps command • 8 kbps telemetry • 20 Mbps high rate telemetry • S-band • Data Latency Requirements: • 72 hours • Data Recovery: • Assume 98% recovery requirement (end-to-end) • Orbit Determination via DSN ranging • 60 mins/day during transfer phase; 30 mins/day on-orbit

  10. Ground System Functional Architecture Basis of cost study is in red Legend: CMD = Commanding HK = House-Keeping data TLM = Telemetry data Critical Event Support TLM: 1 kbps CMD: 1 kbps S-band via HGA TLM: 20 Mbps 8 Mbps CMD: 2 kbps Science Ops Center Data Processing and Analysis Experiment planning Payload monitoring X-ray WFI Mission Ops Center Mission planning & scheduling Orbit determination/control Network & contact scheduling Commanding S/C monitor/control RT health/safety processing Trending/Analysis Instrument data handling Level 0 product processing Level 0 Data Archive DSN 34 meter sites Voice TLM, HK WSC TLM, HK CMD TLM, HK CMD

  11. MOC Architecture (typical) Level Zero Processing Attitude Control Flight Dynamics * Telemetry & Command Data Front-end System Ground Stations * SOC LAN/Message Bus Mission File Server /Archive Anomaly Notification Event Display/ Logging Data Analysis & Trending Mission Planning & Scheduling * not costed in Ops estimate Email & Internet Access Internet

  12. Technology Required • Use COTS/GOTS-based MOC as basis for MOC implementation • Software packages are available to satisfy MOC required functionality: • ITOS, ASIST, EPOCH 2000, ALTAIR are commercially available today and provide required functionality for Spacecraft Command/Control and Level Zero (LZ) Processing. • Low data volume so no special/new technology required • Most required technologies have been at least demonstrated; many in currently operational systems. • Technology Complexity: Low • Technology Readiness Level: 9

  13. Cost Basis of Estimate • Goddard estimated FY2012 Cost Rates used ((FY2010*.024)*.026) • More detail available in the Excel Spreadsheets • Development Cost Assumptions • For MOC planning/scheduling, command load generation/validation and data processing support • Provides three physical h/w strings (primary & backup) • Most MOC functions are provided by COTS and/or GOTS software • Some new development for Mission unique requirements. • Operations Staffing Cost Assumptions • 8 x 5 during critical operations (total of 3 months) • launch & checkout • decommissioning • 4 x 5 during all other timeframes (35-59 months) • Communications Link Cost Assumptions • DSN 34 meter • S-band TT&C via HGA • 2 kbps cmd • 8 kbps tlm • S-band TT&C via Onmi • 1 kbps cmd • 2 kbps tlm • Daily downlinks (7.6 minutes typical, 35 minutes maximum) • Ranging for orbit determination • 60 min/day during transfer phase; 30 min/day on-orbit • T1 links between ground elements (1.544 Mbps) • TDRSS for launch & early mission • 1 kbps cmd • 1 kbps tlm • Level 0 Processing • Data available near real time • NOTE: FDF costs are provided by the FDF engineer; SOC costs are provided by the customer

  14. Period 4 (2 months) Period 5 (38 - 62 months) Mission Schedule Preliminary Design Final Design Disposal/ Cleanup Payload Primary Ops System Definition Bus Fab/Assy/Test Launch, C/O & Cruise Obs Fab/Assy/Test Phase B Start 8/8/16 Launch Ops Project Start 8/8/14 CDR 5/8/18 PDR 7/8/17 Phase C Design Phase B Definition Phase A Preliminary Analysis Period 1 (22 months) Mission Definition 11 months 24 months 11 months Period 6 (3 months) Launch 1/1/21 Disposal 4/1/24 Period 3 (2 months) Phase D-1 Subsystem Development and Spacecraft Integration and Test Phase E/F Operations Phase D-2 Launch & Checkout Period 2 (28 months) Period 5-1 (1 month) 16 mo 3 mo 12 mo 36 mo 3 mo 3 months 31 months 39 months

  15. Staffing Periods Used for Costing

  16. Cost Summary (FY 2012 Dollars)

  17. Risk/Issues/Concerns • Risks • none • Issues • none • Concerns • none

  18. Additional Trades • Benefits of co-locating MOC & SOC • Spreads facility costs among missions • Shared communication lines • Staffing reduced to 3x5 (or even less) during non-critical operations • Reduce MOC hardware strings from 3 to 2

  19. Acronyms ADCS Attitude Determination & Control System BER Bit Error Rate CDR Critical Design Review CMD Command COTS Commercial Orbital Transportation Services or Commercial Off the Shelf DSN Deep Space Network EOM End of Mission ES L2 Earth – Sun Lagrange Point FT Functional Test GOTS Government Off the Shelf HGA High Gain Antenna HK Housekeeping Kbps Kilo-bits per second LV Launch Vehicle LZP Level Zero Processing Mbps Mega-bits per second MOC Mission Operations Center RT Real Time SA Solar Array S/C Spacecraft SOC Science Operations Center TDRSS Tracking & Data Relay Satellite System TLM Telemetry ITOS, ASIST, EPOCH 2000, ALTAIR are commercially available software packages for controlling spacecraft & performing level zero processing

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