CryoSat Mission Preparation: A Cost Savings and Quality Improvement Case Study

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CryoSat Mission Preparation A Cost Savings and
Quality Improvement Case Study

• Jim Cater
• Klaus Dieter Mau
• Nic Mardle
• David Quigley

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CryoSat Mission

• Mission objectives - Ice altimetry with high
  spatial resolution for
• Ice Sheet Interiors (Conventional LRM Mode)
• Sea Ice (High Resolution SAR Mode)
• Ice Sheet Margins (High Res. SARInMode)
• Overall Ice Sheets (LRM and SARInMode)

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CryoSat Instrument Layout
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CryoSat Mission Complexity

• The CryoSat spacecraft database consists of
  approximately
• 7,000 telemetry parameters and
• 1,700 commands
• The Flight Operations Manual contains over 450
  individual procedures

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MOIS Background

• MOIS provides an integrated suite of tools for
  procedure
• Design development
• Validation
• Execution
• Maintenance
• MOIS generates
• Manuals
• Procedures
• Languages
• Reports
• Real-time procedure scheduling and automation
  engine

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Procedure Development

• Procedure flow designed graphically using the
  MOIS Flowcharter.
• Logic constructs include
• If
• Repeat-Until
• While
• Case
• Wait

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Procedure Development (cont.)

• Procedure details guided by spacecraft data
• Telemetry and commands selected from DB
• Calibration and limit data provided to developer
• Procedure calls selected from Library
• Enforced variable type usage

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EADS-Astrium Configuration
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MOIS Execution Environment
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SCOS-2000 Execution Environment
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Scope of MOIS Usage
Hot Spots 2 Unfocused effort on coding and
validation of Operations and Test Sequences 4
Delivery of Flight Operations Manual 5
Procedures tend to be control system dependent 6
Inefficiencies due to incompatibility of
systems 7 Black boxes become black holes
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Hot Spot 2

• MOIS minimised control system coding and
  validation
• EADS-Astrium developed and validated procedures
  within MOIS
• ESOC generated SCOS-2000 command sequences
  directly from MOIS procedures
• Minor repackaging and modifications required for
  SCOS-2000 specific operations

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Hot Spot 3

• MOIS reduced formal delivery overhead and
  complexity
• FOM generated directly from MOIS Procedures,
  which had been validated using the EADS-Astrium
  EGSE and MOIS Validator
• 20 full and partial deliveries of FOM data during
  development life-cycle
• SVT-0 had zero procedural issues

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Hot Spot 4

• Although the MOIS database was not used as the
  transfer mechanism
• The MOIS procedures were developed,
  consistency-checked and validated using a
  SCOS-2000 compliant DB
• EADS-Astrium delivered this DB with the FOM
• Base DB enhanced with ESOC specific data
• Number of DB issues greatly reduced

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Hot Spot 5

• MOIS demonstrated the potential for abstracting
  satellite control procedures from the underlying
  system
• CGS language scripts not used
• Minimal changes needed for SCOS-2000 less than
  5 of sequences caused problems
• Engineers concentrate on enhancing operations
  rather than transcribing data

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Hot Spots 6 7

• Interface documentation was minimised
• No multi-level format definitions
• Procedure Rules and Guidelines (How-to)
• Ops management had tools to provide objective
  evidence of
• Development status
• Validation status
• Delivery status

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CryoSat-2

• Potential for further efficiencies
• Easy identification of procedural impacts due to
  variations between the two satellites.
• Improved process for new procedures
• Enhanced set of development guidelines
• Potential use of MOIS execution environment at
  ESOC
• Potential use of MOIS by EADS-Astrium AIV
• Paper AIAA-2006-5710 Smart- 1 Ground Operations
  Automation Session 31 Wednesday.

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Conclusions

• Efficient and effective flight procedure
  development and maintenance.
• Efficient and effective testing of flight
  procedures when MOIS execution environment is
  used.
• Greater consistency between procedures and
  telemetry and telecommand definitions.
• Minimal conversion of procedural data required
  for different control systems.
• Efficient and effective re-use of operations
  knowledge between similar satellites.