Transcript HMI Top Level Requirements Rock Bush Stanford HMI Program Manager

HMI00447
HMI Top Level Requirements
Rock Bush
Stanford HMI Program Manager
[email protected]
HMI Preliminary Design Review – Nov. 18 &19, 2003
HMI Requirements – Bush; Page 1
Requirements Overview
• Basis of Requirements
• Requirements Sources
• Draft HMI Functional Specifications
HMI Preliminary Design Review – Nov. 18 &19, 2003
HMI Requirements – Bush; Page 2
Basis of Requirements
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HMI Science Objectives
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Duration of mission
Completeness of coverage
HMI Science Data Products
Roll accuracy
Time accuracy (months)
HMI Observation Sequences
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Duration of sequence
Cadence
Completeness data sequence
Noise
Resolution
Time accuracy (days)
HMI Observables
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Sensitivity
Linearity
Acceptable measurement noise
Image stability
Time rate (minutes)
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Orbit knowledge
HMI Preliminary Design Review – Nov. 18 &19, 2003
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HMI Instrument Data
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Accuracy
Noise levels
Completeness of filtergrams
Tuning & shutter repeatability
Wavelength knowledge
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Image registration
Image orientation jitter
HMI Instrument Concept
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Mass
Power
Telemetry
Envelope
Subsystem requirements
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CCD: Thermal environment
ISS: pointing drift rate, jitter
Legs: pointing drift range
HMI Requirements – Bush; Page 3
Basic Requirements Sources
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SDO Level 1 Requirements
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SDO Mission Requirements Document (MRD)
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HMI Instrument Functional Specification
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Detailed HMI science drivers and flowdown to subsystem requirements
SDO Mission Assurance Requirements
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Top level HMI requirements – part of the HMI contract statement of work
HMI Instrument Performance Document (IPD)
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Summary of spacecraft and instrument driving requirements
SDO spacecraft and instrument requirements for design, fabrication, verification, etc.
HMI Performance Assurance and Implementation Plan (PAIP)
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HMI implementation of the SDO MAR
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HMI to Spacecraft Interface Control Documents (HMI-S/C ICD)
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Ground System Interface Control Document
HMI Preliminary Design Review – Nov. 18 &19, 2003
HMI Requirements – Bush; Page 4
HMI Requirements
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The HMI Functional Specification is the contractual link between the SDO
project office and the HMI development team.
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The Functional Specification documents the key instrument parameters needed to meet the
HMI goals.
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The Draft Functional Specification is summarized in the next chart, and the verification will be
discussed during the test and integration presentation.
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The Functional Specification is under review and will be finalized as part of the Phase C/D
contract negotiations.
The HMI Instrument Performance Document (IPD) details the HMI observations
required to meet the science goals, and the derived subsystem design and
performance requirements.
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The IPD contains three sections:
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Instrument observations required to meet the science objectives
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Instrument performance requirements needed to obtain the observations
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Detailed subsystem design specifications needed to obtain the specified performance
The HMI Performance Document is modeled after the Michelson Doppler Imager Instrument
Performance Specification.
HMI Preliminary Design Review – Nov. 18 &19, 2003
HMI Requirements – Bush; Page 5
HMI Functional Specifications Summary
Parameter
Requirement
Central wavelength
Filter bandwidth
Filter tuning range
Central wavelength drift
Field of view
Angular resolution
Focus adjustment range
Pointing jitter reduction factor
Image stabilization offset range
Pointing adjustment range
Pointing adjustment step size
Dopplergram cadence
Image cadence for each camera
Full image readout rate
Exposure knowledge
Timing accuracy
Detector format
Detector resolution
Science telemetry compression
Eclipse recovery
Instrument design lifetime
6173.3 Å ± 0.1 Å (Fe I line)
76 mÅ ± 10 mÅ fwhm
680 mÅ ± 68 mÅ
< 10 mÅ during any 1 hour period
> 2000 arc-seconds
better than 1.5 arc-seconds
± 4 depths of focus
> 40db with servo bandwidth > 30 Hz
> ± 14 arc-seconds in pitch and yaw
> ± 200 arc-seconds in pitch and yaw
< 2 arc-seconds in pitch and yaw
< 50 seconds
< 4 seconds
< 3.2 seconds
< 5 microseconds
< 0.1 seconds of ground reference time
> 4000 x 4000 pixels
0.50 ± 0.01 arc-second / pixel
To fit without loss in allocated telemetry
< 60 minutes after eclipse end
5 years at geosynchronous orbit
HMI Preliminary Design Review – Nov. 18 &19, 2003
HMI Requirements – Bush; Page 6