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Subsections


The Use Cases

Observer Uses GBT

Context of UseUsing the GBT the observer gathers and processes all the data which is expected to provide at least a partial answer to an empirical question.

ScopeObserving with the GBT (Organization, black box)

LevelSummary

Primary ActorObserver

Stakeholders and Interestsscheduler: efficiency, happy observer , approved-only observing
engineer: failures are handled by operator or reported fully

Preconditionobserver has a well-formed empirical question

Minimal Guaranteesobserver has an answer; or understands why an answer was not achieved

Success Guarantees

Trigger

Main Success Scenario

  1. observer obtains telescope time on the GBT.
  2. observer collects data using GO.
  3. observer reduces data using a data program

Extensions

Technology and Data Variations List

Related Information

Collects Data

Context of UseThe observer runs a scheduled set of observations which are expected to successfully produce relevant data

ScopeGBT M & C (System, black box)

LevelUser-goal

Primary ActorObserver

Stakeholders and Interests

Preconditiongood weather, operational system

Minimal Guaranteesclean data or rescheduled observing (?)

Success Guarantees

Triggertelescope time

Main Success Scenario

  1. observer selects telescope configuration using GO.

  2. observer runs scans using GO.

Extensions

Technology and Data Variations List

Related Information

Reduces Data

Context of Use

Scope

Level

Primary Actor

Stakeholders and Interests

Precondition

Minimal Guarantees

Success Guarantees

Trigger

Main Success Scenario

Extensions

Technology and Data Variations List

Related Information

Selects Telescope Configuration

Context of UseThe observer through various menu options, pre-defined templates, and value settings in GO sets up the telescope for observing.

ScopeGO (System, black box)

LevelUser-goal

Primary ActorObserver

Stakeholders and Interests

PreconditionGO is running

Minimal GuaranteesA valid configuration is selected or the appropriate error messages are generated.

Success Guarantees

Trigger

Main Success Scenario

  1. observer selects receiver
  2. observer selects system observing type
  3. observer selects backend
  4. observer selects switching mode
  5. observer selects power levels
  6. observer selects observing procedure
  7. observer selects coordinate system
  8. observer selects antenna movement

Extensions

Technology and Data Variations List

Related Information

Selects Receiver

Context of Use

ScopeGo (system, black box)

LevelUse-goal

Primary ActorObserver

Stakeholders and Interests

Precondition

  1. Receiver is operational
  2. Cabling file is current

Minimal GuaranteesUseful message/error code is generated.

Success GuaranteesSelected receiver is properly configured.

Trigger

Main Success Scenario

  1. Operator verifies receiver is in correct position.
  2. Observer selects receiver settings.
  3. System selects connectivity.
  4. System selects appropriate devices.

Extensions

  1. Error conditions for Main Success Scenario step 1.
    1. Receiver is not in position - Sees tandard operating procedures

Technology and Data Variations List

Related Information

Selects System Observing Type

Context of Use

Scope

Level

Primary Actor

Stakeholders and Interests

Precondition

Minimal Guarantees

Success Guarantees

Trigger

Main Success Scenario

Extensions

Technology and Data Variations List

Related Information

Selects Backend

Context of Use

Scope

Level

Primary Actor

Stakeholders and Interests

Precondition

Minimal Guarantees

Success Guarantees

Trigger

Main Success Scenario

Extensions

Technology and Data Variations List

Related Information

Selects Switching Mode

Context of Use

Scope

Level

Primary Actor

Stakeholders and Interests

Precondition

Minimal Guarantees

Success Guarantees

Trigger

Main Success Scenario

Extensions

Technology and Data Variations List

Related Information

Selects Power Levels

Context of Use

Scope

Level

Primary Actor

Stakeholders and Interests

Precondition

Minimal Guarantees

Success Guarantees

Trigger

Main Success Scenario

Extensions

Technology and Data Variations List

Related Information

Selects Observing Procedure

Context of Use

Scope

Level

Primary Actor

Stakeholders and Interests

Precondition

Minimal Guarantees

Success Guarantees

Trigger

Main Success Scenario

Extensions

Technology and Data Variations List

Related Information

Selects Coordinate System

Context of Use

Scope

Level

Primary Actor

Stakeholders and Interests

Precondition

Minimal Guarantees

Success Guarantees

Trigger

Main Success Scenario

Extensions

Technology and Data Variations List

Related Information

Selects Antenna Movement

Context of Use

Scope

Level

Primary Actor

Stakeholders and Interests

Precondition

Minimal Guarantees

Success Guarantees

Trigger

Main Success Scenario

Extensions

Technology and Data Variations List

Related Information

Obtains Telescope Time

Context of Use

Scope

Level

Primary Actor

Stakeholders and Interests

Precondition

Minimal Guarantees

Success Guarantees

Trigger

Main Success Scenario

Extensions

Technology and Data Variations List

Related Information

Run Scans

Context of Use

Scope

Level

Primary Actor

Stakeholders and Interests

Precondition

Minimal Guarantees

Success Guarantees

Trigger

Main Success Scenario

Extensions

Technology and Data Variations List

Related Information


next up previous
Next: About this document ... Up: GBT_use_cases Previous: Design Scope Diagram
Bob Garwood
2011-07-25