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Systems Engineering

Systems Engineering

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Systems Engineering

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  1. Systems Engineering Chad Fish chad.fish@sdl.usu.edu 435-797-0469

  2. Presentation Overview • Key System Requirements • System Design • System Operation • Technical Resources and Error Budgets • Post-PDR System Changes • Technical Risks • Technical Coordination • Summary • Supplementary Material • Error Budget Models • Level 3 Requirements Compendium

  3. Key System Requirements

  4. Science Objectives • SOFIE will support AIM mission in study of PMCs and the environment in which they form. SOFIE will use differential solar occultation to measure: • Five gaseous species (H2O, CO2, O3, CH4, NO) • Temperature • Particle extinction at 10 wavelengths • Each SOFIE channel uses two detectors to make three measurements: • Strong band absorption • Weak band absorption • Difference signal (weak band – strong band = ΔV) Remove interference and reduce noise!

  5. System Requirements

  6. System Requirements (cont)

  7. System Requirements (Cont) SOF 174 : Measurement Bands SOF 183 : Radiometric SNR

  8. System Requirements (cont)

  9. System Design

  10. Environmental Orbital Considerations

  11. Instrument Unit Purpose: Perform science signal detection & FOV pointing and stabilization control Contains: Opto-mechanics Mirrors, filters, beam splitters, field-stop, chopper [1.8’ x 6’ Inst FOV; 32º x 24º Glint FOV] Detector assemblies (includes TECs and PreAmps) Steering mirror [4º x 4º FOR] Sun sensor electronics and software [2º x 2º FOV] Electronics Unit Purpose: Perform system command and control, communication, signal conditioning, and power conditioning Contains: Command and data handling electronics and system software Position and stabilization control electronics and software Communication, signal conditioning, and mechanisms control electronics and software Thermal sensor, TEC thermal control, and housekeeping electronics Power conditioning electronics Design Description

  12. System Block Diagram

  13. Spacecraft Configuration

  14. Instrument Unit Radiator Pin pullers Aperture cover Steering mirror Alignment cubes N2 Purge Witness Mirrors (x4) Circular connector interfaces Dynamic Envelope: 16.2 x 26.3 x 29.5 inches SC Isolator Feet (eff 14° wedge)

  15. SOFIE Instrument Unit (cont) POINTING AND STABILIZATION CONTROL Sun Sensor SIGNAL DETECTION Channel Separation Module

  16. SOFIE Electronics Unit Electronics PCBs Top Connectors and Cabling SC Radiator Panel Power Conditioning Dynamic Envelope: 16.2 x 26.3 x 29.5 inches

  17. System Operation

  18. Modes of Operation Survival

  19. Modes of Operation (cont)

  20. Science Mode

  21. Science Mode (cont)

  22. Science Mode (cont) Maximum science measurement duration (AQR, DATA) = 155 seconds

  23. Science Mode (cont)

  24. Conceptual Science Mode Operational Profile

  25. Solar Acquisition and Tracking

  26. Solar Scanning and Maneuvering Vertical Scanning FOV Azimuthal Offsetting (bore sighting)

  27. Science Data Products 2 1 1 1 El Az

  28. Commissioning Phase

  29. System Technical Resources & Error Budgets

  30. Technical Resources Resource margin and reserve managed by mission

  31. Mass Budget

  32. Power Budget

  33. Orbital Power Profile

  34. Resource Tracking

  35. Error Budgets

  36. Post-PDR System Changes

  37. Changes since PDR SMA Caging Mechanism Removed Wedge Removed Radiator Reshaped Cable Ports Relocated

  38. Changes since PDR (cont) Repositioned in SC and Radiator Removed Electronics Power Conditioning Redesigned Detector Packages now Non-hermetic

  39. System Technical Risks

  40. Technical Risks RISK ID = SOFIE_RISK_4 SOFIE depends upon an active pointing system to provide the required sun pointing accuracy and precision. The active pointing and control system algorithm may be unable to provide the required sun pointing accuracy and precision and the science capability would be degraded. CRITICALITY Green MITIGATION Extensive prototype and protoflight testing will be conducted.

  41. System Technical Coordination

  42. Technical Coordination – SDL Design Processes • Engineering Design and Development • System Design • QP0401 • Software Design • QP0406 • Document Control and Configuration Management • Document Control • QP0501 • Software Configuration Management • QP0403, SOFIE Software Configuration Management Plan • SDL to maintain up-down information flow • Waivers, Problem Failure Reports (PFR) • QP1301

  43. Technical Coordination – Internal Peer Review • Review follows Breadboard/Prototype design phase • Includes SDL members both internal and external to SOFIE • System and component level • Following review, design placed in configuration control

  44. Technical Coordination – SDL Design Processes (cont)

  45. Documentation Status

  46. Designs are mature and provide margin on system requirements Technical resources are being managed and tracked Error budgets are being managed SE Summary

  47. Supplementary Material

  48. Radiometric System Requirements SOF 174 : Measurement Bands SOF 183 : Radiometric SNR

  49. Radiometric Model Error Budget Optical Input Path

  50. Radiometric Model Error Budget (cont) Optical Math Model Transfer Function