Use Cases (Requirements View)

Mode Switching & AT System

• AT System Start - Day-time to observation mode transition
• AT System Stop - Observation to day-time mode transition

• ATCS Cold Start
• ATCS Start
• ATCS Stop
• ATCS Shutdown
• ATCS Global System State Update
• Ignore/Un-ignore Sub-System
• Select Observing Instrument
• Get Instrument Data
• Set Instrument Data

• Configure AT to Relocation State
• Configure AT to Desired State After Relocation
• Get AT Observing Station ID

• ATCS Control GUI
• ATCS Status GUI

Preset

• Preset Telescope to Astronomical Coordinates
• Preset Telescope to Given Object in Catalogue
• Preset Telescope in Alt/Az Coordinates
• Preset Telescope to Named Position
• Stop Telescope Motion

Pointing Modelling

• Adjust Pointing Axis Reference Points
• Measure and Install Pointing Model
• Make Pointing Error Measurement
• Make Pointing Model from Given Measurements
• Install Pointing Model
• Modify Pointing Model Term
• Set Storage Mode for Pointing Measurements
• Store Actual Position inPointing Measurements File

• Pointing Modelling Configuration and Control GUI

Optical Adjustments

• Prepare for Image Alignment
• Guide Probe to Beacon (Acquire Beacon)
• Offset Guide Probe on Beacon
• Stop Image Alignment
• Prepare for Pupil Alignment
• Stop Pupil Alignment
• Prepare for Delay Constant Alignment
• Stop Delay Constant Alignment
• Prepare for VLTI focus Adjustment
• Stop VLTI Focus Adjustment
• Calibrate M6 versus Coudé Sensors
• Calibrate Az axis
• Check STRAP Pupil Alignment
• Adjust Coudé Focus

• Optical Alignments Configuration and Control GUI

Tracking

• Telescope Offset
• Offset Alt/Az
• Set Tracking Additional Velocity
• Set Tracking Wave Length
• Get Remaining Tracking Time
• Set Remaining Tracking Time Limit

Autoguiding

• Start Autoguiding
• Stop Autoguiding
• Center Object
• Center Guide Star
• Combined Offset
• Offset Guide Probe on Star
• Set Guide Parameters

• Probe To Next Guide Star
• Set Guide Reference Point
• Get Guide Star Data

• Autoguiding Configuration and Control GUI

Field Acquisition Sensor

• Start Field Acquisition
• Stop Field Acquisition
• Prepare FAS Setup
• Send FAS Setup
• Set FAS Integration Time

• Display Guide Detector Signals
• Save Guide Detector Image
• Set Guide Window Size

• FAS Configuration and Control GUI

Field Stabilization

• Start Field Stabilization
• Stop Field Stabilization
• Optimize Field Stabilization

• Center Guide Star (same as for Autoguiding)
• Set Guide Parameters (same as for Autoguiding)

• Probe To Next Guide Star (same as for Autoguiding)
• Set Guide Reference Point (same as for Autoguiding)
• Get Guide Star Data (same as for Autoguiding)

• Field Stabilization Configuration and Control GUI

Field Stabilization Sensor

• Start FSS Acquisition
• Stop FSS Acquisition
• Prepare FSS Setup
• Send FSS Setup
• Display Guide Detector Signals (same as for Autoguiding)
• FSS Configuration and Control GUI

Field Stabilization Subsystem Devices

• Set FSS Filter Wheel
• Get FSS Filter Wheel
• Set FSS Aperture Field Diaphragm
• Get FSS Aperture Field Diaphragm
• Preset Probe

Chopping

• Start Chopping
• Stop Chopping
• Configure Chopping
• Enable Field Stabilization
• Disable Field Stabilization

• Chopping Configuration and Control GUI

Active Optics

• Start Cyclic Closed Loop Active Optics
• Do one correction
• Do one calibrated correction
• Do one Image Analysis
• Start cyclic calibrated corrections
• Stop ongoing active optics action

Monitoring

• Monitor Environmental Data
• Monitor Temperature Data

M2 control

• Set M2 Focus Position
• Get M2 Focus Position
• Set M2 Center Position
• Get M2 Center Position
• Set M2 Tilt Angles
• Get M2 Tilt Angles
• Switch On/Off M2 Pupil Beacon Light Source
• Set M2 Pupil Beacon Light Level

M6 control

• Center M6
• Set M6 Tilt Angles
• Get M6 Tilt Angles

M10 control

• Center M10
• Set M10 Tilt Angles
• Get M10 Tilt Angles

Coudé Devices

• Set Coudé Beam Switching Device

Nasmyth Devices

• Switch On/Off Nasmyth Beacon Light Source
• Set Nasmyth Beacon Light Level
• Set Nasmyth Wheel

Relay Optics Shutter

• Control Relay Optics Structure (ROS) Shutter
• Retrieve Relay Optics Structure (ROS) Shutter status

Enclosure

• Open Enclosure
• Check Enclosure Status
• Close Enclosure
• Close Enclosure on Bad Meteo conditions
• Monitor Enclosure Anemometer

Air Conditioning

• Start Air Conditioning
• Set Air Conditioning Reference Temperature
• Check Air Conditioning Status
• Get Temperature
• Stop Air Conditioning

Thermal control Subsystem

• Periodic Set Air Conditioning Reference Temperature

Service Modules

• Check Power Module Status

• Monitor Hydraulic and Pneumatic Systems
• Control Hydraulic and Pneumatic Systems

• Check Liquid Cooling Module Status
• Monitor Flow-meter

• Check Cabinet Cooling Module Status

• Monitor Telescope Temperature Sensors
• Read Telescope Temperature Sensors

Transporter Subsystem

• Check Status Anchoring Devices

Use Cases dedicated to Maintenance/Tuning & Installation

Collaboration Cases

This sub-section describes some Collaboration Cases that are important at the level of requirement specification.

Preset CC

• Handle Setup File

Tracking CC

• Autoguider Offset
• Offset Alpha/Delta
• Tracking Loop
• Telescope Pointing Machine
• Axis Position Control
• FSS Control Loop

Autoguiding, Field Stabilization & Chopping CC

• Check Autoguiding Conditions
• Autoguiding Control loop
• Field Stabilization Monitoring loop
• M6 Control Loop
• Chopping Control Loop

Field Stabilization Subsystem CC

• Compute Interaction Matrix
• Update Interaction Matrix
• Close APD Loop
• Open APD Loop
• Set APD Gate
• Set FSS Translation Stage

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Last modified: Tue Oct 29 16:15:52 UTC 2002