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Kequan Luu May 13-17, 2002

Micro-Arcsecond Imaging Mission, Pathfinder (MAXIM-PF). Flight Software. Kequan Luu May 13-17, 2002. Flight Software Topics. Cost Drivers C&DH Software Functional Overview ACS/ACE Software Functional Overview Instrument Software Functional Overview

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Kequan Luu May 13-17, 2002

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  1. Micro-Arcsecond Imaging Mission, Pathfinder (MAXIM-PF) Flight Software Kequan Luu May 13-17, 2002

  2. Flight Software Topics • Cost Drivers • C&DH Software Functional Overview • ACS/ACE Software Functional Overview • Instrument Software Functional Overview • Required Software Development Environments • Cost Estimates • Risk Assessment • Issues & Concerns MAXIM-PF, May 13-17, 2002Goddard Space Flight Center

  3. Cost Drivers • Two Mission Phases of Spacecraft Constellation Configurations • Hub & Mirrorsats Attached through Mission Phase 1 • Hub & Mirrorsats Detached through Mission Phase 2 • Constellation Management (Comm, Science Ops, Redundancy, FDC, etc) • Smart PSE for “Extra/Better” Science Ops. MAXIM-PF, May 13-17, 2002Goddard Space Flight Center

  4. Function Command Ingest & Distribution R/T H-K Telemetry Transmit Power Control (Smart PSE) Science Ops Schedule Mgt S/C H-K data collection S/C & Instrument H-K data storage & playback Science data playback S/C & Instrument H&S monitoring Real-time OS File Management S/C time maintenance & distribution (NTP) IP/Ethernet onboard & space-space communications IP/Ethernet onboard & space-ground communications I/F Management Hub (1) yes (from Det) yes yes no yes no no yes yes yes yes yes no yes Flight SoftwareC&DH Software Functions Detector (1) yes (from GN) yes yes yes yes yes yes yes yes yes yes yes yes no MirrorSat (6) yes (from Hub) yes yes no yes no no yes yes yes yes yes no yes MAXIM-PF, May 13-17, 2002Goddard Space Flight Center

  5. ACS/ACE Software Functions(Detector) • Disturbance & Inertia Estimations • Adoptive Control & Formation Flying • ACE Safemode Processing • Execute Science Mode Processing • Execute Maneuver Mode • Guide Star Processing • Compute/Check Target Quaternion • HGA Pointing • Generate Commands • Thrusters • Micro-Newton Thrusters • ST • HGA • Detect & Process ACS Faults • Sensor Data Acquisition & Processing • CSS (8) • ST (2) • IRU (1) • Accelerometer (1) • Thrusters (4) • Micro-Newton Thrusters (12) • Validate Ephemeris Update • Compute Solar Ephemeris • Compute Lunar Ephemeris • Compute Total Momentum • Estimate State Vector MAXIM-PF, May 13-17, 2002Goddard Space Flight Center

  6. Sensor Data Acquisition & Processing CSS (8) ST (2) IRU (1) Accelerometer (1) Thrusters (4) Micro-Newton Thrusters (12) Beacons for MirrorSat (6) Beacon for Detector (1) Validate Ephemeris Update Compute Solar Ephemeris Compute Lunar Ephemeris Compute Total Momentum Estimate State Vector Disturbance & Inertia Estimations Adoptive Control & Formation Flying ACE Safemode Processing Collision Avoidance Execute Science Mode Processing Execute Maneuver Mode Guide Star Processing Compute/Check Target Quaternion HGA Pointing Generate Commands Thrusters Micro-Newton Thrusters ST HGA Detect & Process ACS Faults (2 configurations, self & MirrorSats when attached) ACS/ACE Software Functions (Hub) MAXIM-PF, May 13-17, 2002Goddard Space Flight Center

  7. Sensor Data Acquisition & Processing CSS (8) ST (2) IRU (1) Swarm Sensor (1) Thrusters (4) Micro-Newton Thrusters (12) Validate Ephemeris Update Compute Solar Ephemeris Compute Lunar Ephemeris Compute Total Momentum Estimate State Vector Disturbance & Inertia Estimations Adoptive Control & Formation Flying ACE Safemode Processing Collision Avoidance Execute Science Mode Processing Execute Maneuver Mode Guide Star Processing Compute/Check Target Quaternion Generate Commands Thrusters Micro-Newton Thrusters ST Detect & Process ACS Faults ACS/ACE Software Functions (MirrorSat) MAXIM-PF, May 13-17, 2002Goddard Space Flight Center

  8. Function Mechanisms control Exposure control Read out CCD Calibration H-K data collection Detector (1) yes yes yes yes yes Instrument Software Functions Hub (1) • yes • yes • yes • yes • yes MirrorSat (6) • yes • no • no • yes • yes MAXIM-PF, May 13-17, 2002Goddard Space Flight Center

  9. Typical Phase I Development Test Bed SI data simulator Development Workstation Serial Interface Ground System Workstations Misc data simulator ACS/C&DH (Detector) Transponder Simulator Hybrid Dynamic Simulator Spacecraft External Data Bus (IP/Ethernet) ACE (Detector) A similar configuration for Hub/MirrorSat not shown Development Workstation MAXIM-PF, May 13-17, 2002Goddard Space Flight Center

  10. Final Phase Development (System) Test Bed MirrorSat Constellation Simulator (n-1) Ground System Workstations Hub/MirrorSat Development String Detector Development String Transponder Simulator Transponder Simulator Hub External Data Bus MSat External Data Bus MAXIM-PF, May 13-17, 2002Goddard Space Flight Center

  11. Flight Software Cost Estimates Summary • ItemDetector ($k)Hub ($k)MirroSats ($k) • Mgt & SW Sys. Eng. 06 (0,900) 06 (0,900) 06 (0,900) • C&DH Software 15 (2,250) 18 (2,700) 20 (3,000) • ACS/ACE Software 20 (3,000) 25 (3,750) 25 (3,750) • PSE Software 04 (0,600) 04 (0,600) 09 (1,350) • Instrument Software 04 (0,600) 04 (0,600) 09 (1,350) • Software Systems Test 05 (0,750) 07 (1,050) 10 (1,500) • Formation Flying System Test 02 (0,300) 03 (0,450) 07 (1,050) • I&T, H/W Spt. & Maint. 08 (1,200) 08 (1,200) 12 (1,800) • Testbed Engineering 02 (0,300) 02 (0,300) 05 (0,750) • Hardware & Software Tools (0,200) (0,200) (0,500) • Total Labor* & Materials 66 (10,100) 77 (11,750) 103 (15,950) • Grand Total 246 FTEs (37,800k) Assumed $150K/M-Y Breadboards & ETUs for C&DH, PSE & ACE, ACS HDS, GSE and Front-end simulator book-kept elsewhere MAXIM-PF, May 13-17, 2002Goddard Space Flight Center

  12. Flight Software Risk Assessment • WV IV&V Cost keep at project level. • Today/near-future flight CPU can handle the estimated processing • Flight IP/Ethernet technologies should be matured in 2010 • New concepts required for software system-level testing due to nature of constellation • MirrorSat Constellation simulator in addition to traditional HDS • Phased testbed development environment ranging from single subsystem c/o to full flight data system string (over 30 sets of software system development) • Early data system component development required to support FSW development in all areas to mitigate risks • Early development and c/o of breadboards/ETUs will be required • Typical software risks apply • Good industry practices • Adequate test time • Adequate test resources • Adequate documentation MAXIM-PF, May 13-17, 2002Goddard Space Flight Center

  13. Flight SoftwareIssues and Concerns • Several novel control concepts required to manage this particular constellation • No heritage in developing test strategy for this type of application • Multiple constellation configurations of mission phases add significant complexity to flight software and test strategy. • Further development of concept of failure detection & correction, and redundancy management is required. • Cost may be significantly differ from today estimates (recommend further development of the concept) • Procurement strategy will have a significant impact (# of sources) MAXIM-PF, May 13-17, 2002Goddard Space Flight Center

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