OptInt PmWiki : MROI Fast Tip Tilt / Derived Requirements Document Outline

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TODO:

• Identify missing requirements
• Do any derived requirements depend on others? If so, how to express this in the document?
• Copy finished outline into a proper document
• Get document identifier

Derived Requirements Document

1. Introduction
2. Conceptual Design Assumptions
3. Pixel Scale
   Note that there is a top-level requirement on the pixel scale for the FLC.
   1. Top-level requirements
      1. FTT/NAS: FOV
   2. Design assumptions
      May refer to high-level features of assumed design described above in "Conceptual Design Assumptions"
   3. Derived requirements
      1. Maximum and minimum pixel scales for FTT/NAS
4. FTT mode subframe size
   1. Top-level requirements
      1. FTT-mode FOV
      2. Dispersion-offset guiding: rate of change of dispersion offset
      3. Off-axis TT sensing: Max. off-axis distance for TT reference object
   2. Design assumptions
      1. Thermal drift rate of TT zero point
   3. Derived requirements
      1. Min. subframe size /arcsec (so its independent of pixel scale)
5. Image Quality
   1. Top-level requirements
      1. FTT/NAS: none
      2. FLC: XXX
   2. Design assumptions
      1. Two or more conceptual layouts
   3. Derived requirements
      1. Top-down image quality budget, by component
6. Stability of Tip-tilt Zero Point
   1. Top-level requirements
      1. FTT/NAS: Stability req
      2. FLC: Looser stability req
   2. Design assumptions
      1. Two or more conceptual layouts
   3. Derived requirements
      1. Top-down stability budget, by component
7. Thermal Management
   1. Top-level requirements
      1. Heat dissipation
      2. Power consumption
   2. Design assumptions
      1. Camera in a box etc.
   3. Derived requirements
      1. Cooling needs
      2. Power budget
8. Closed-loop Bandwidth
   1. Top-level requirements
      1. 3dB bandwidth of 40Hz
   2. Design assumptions
      1. Servo type
   3. Derived requirements
      1. Latency budget: frame rate, camera latency, compute latency
9. Limiting Sensitivity
   1. Top-level requirements
      1. Limiting magnitude and allowed TT residual at limiting magnitude
   2. Design assumptions
   3. Derived requirements
      1. Throughput budget
      2. CCD noise performance
      3. Max EMCCD gain to be used
10. Dynamic Range
    1. Top-level requirements: none?
    2. Design assumptions
       1. Brightest stars we want to use
       2. Strategy for setting frame rate and EMCCD gain as function of seeing and target magnitude
    3. Derived requirements
       1. Need for ND filters?
       2. Min EMCCD gain to be used