NGAO Performance Flowdown Worksheets

A performance flowdown is the allocation of error terms to constituent subsystems or components

Update (4/25/10): The performance flowdown budget has been placed under configuration control here.

Remaining Tasks for Version 1 release (status as of 9/2/09)

  • Dekany to update WFE/EE budget tool according to 'Action Items' column of the Flowdown Summary, Summary worksheet
  • Dekany to confirm consistency with 'Rainbow Chart'
  • Various to update Contour database to reflect requirements consistent with Version 1 reconciled flowdowns
    • Everyone to check cognizant engineer name atop each sheet for the sheets they are to interpret as updates to the Contour database functional requirements
    • Some flowdown sheets may generate new functional requirements (e.g. uptime req's?)

Remaining Flowdown Tasks for Version 2 release scheduled Feb 2010 (status as of 9/2/09)

  • Reni K. to model non-correctable aberrations in the AO system and post results
  • Neyman (TBC) to work on initial System Uptime MTBF flowdown
  • Gavel to update HO and TT bandwidth latency model to reflect servo design choices
  • Bouchez to provide perform flowdown from tip-tilt star hand-off sequence during long non-sidereal target observations
  • Lu & Dekany to continue refinement of crowded and sparse field relative astrometry budgets
  • Troy to implement TWFS error budget and perform TWFS sky coverage calculations

Component Flowdowns (now obsoleted - refer only the Flowdown Summary (above)

Performance Parameter Flowdown Owner Version Date
Pupil registration
(has been extensively modified in Flowdown Summary)
.xls Velur 0.1 20 May 2009
NCP long exposure
NCP non-sidereal
PnS HOWFS transmission
Internal LOWFS aberrations
Dither errors budget
LGS BTO transmission .xls Stalcup 0.3 19 Aug 2009
LGS spot size
Go-to wavefront errors .xls Dekany 0.8 26 May 2009
Relative astrometry errors
(under revision by J. Lu)
Bandwidth / latency flowdown .xls Gavel 0.2 17 Aug 2009
Acquisition time .xls Bouchez 0.2 19 May 2009
Transmission and Emissivity .xls Kupke 8 15 July 2009
System Uptime (link to sys. eng. page) link Neyman 1 2 July 2009
Topic attachments
I Attachment History Action Size Date Who Comment
Microsoft Excel Spreadsheetxls LGS_FacilityTrans_WFE_Budgets_V0.1.xls r4 r3 r2 r1 manage 78.5 K 2009-08-20 - 02:47 ThomasStalcup LGS facility transmission and WFE budget flowdown
Microsoft Excel Spreadsheetxls LaserWorkingBudget.xls r1 manage 30.5 K 2009-05-20 - 22:56 ViswaVelur Laser Nudget
Microsoft Excel Spreadsheetxls NGAO_Flowdown_Budget_Summary_97_v0_8.xls r1 manage 140.5 K 2009-05-27 - 06:05 RichardDekany  
Microsoft Excel Spreadsheetxls NGAO_Flowdown_Budget_Summary_VV_rev1.xls r2 r1 manage 287.0 K 2009-05-26 - 21:42 ViswaVelur  
Microsoft Excel Spreadsheetxls RTC_errorBudget_per_KAON644.xls r1 manage 108.5 K 2009-08-18 - 15:48 RichardDekany  
Microsoft Excel Spreadsheetxls ThroughputEmissivity_v8_(version_1).xls r1 manage 5345.5 K 2009-07-24 - 00:42 RichardDekany  
Microsoft Excel Spreadsheetxls acq_time_budget_v0.2.xls r1 manage 57.0 K 2009-05-27 - 19:07 AntoninBouchez  
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Topic revision: r19 - 2010-04-26 - RichardDekany
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