Introduction of ROCSAT2 Program

1
IntroductionofROCSAT-2 Program

• Dr. Hung-Chih Wang
• July 24, 1998

2
Outline

• Background of ROCSAT-1 Program
• Goals of ROCSAT-2 Program
• Mission Objectives of ROCSAT-2 Program
• An Overall Architecture of the ROCSAT-2 Program
• Operation Concepts of Mission
• Summary of ROCSAT-2 System Requirements
• Acquisition Strategy of the ROCSAT-2 Program
• Current Status of ROCSAT-2 Program
• Concluding Remarks

3
Background of ROCSAT-1

• ROCSAT-1 is a LEO Satellite Containing Three
  Scientific Instrument ECP, IPEI, and OCI
• During the Development of the ROCSAT-1, NSPO Has
  Established the Following Capabilities
• human resource to execute a space program
• satellite integration and testing facilities
• the ground system infrastructure with mission
  operation center
• the infrastructure of space researches at local
  universities
• a successful flight component development program
  by domestic industry

4
Goals of ROCSAT-2 Program

• To Build-Up a Complete Satellite System with the
  Achievement of both Civilian Applications and
  Scientific Research
• To Develop and Establish the Core Technology of a
  Satellite System and Associated Capability at
  NSPO
• To Establish Human Resource Capability in the
  Area of Both Satellite-Related Technologies and
  Large-Scale System Engineering
• To Enhance the Research in the Space Science and
  Technology and to Promote the International
  Cooperation in the Space Community
• To Maximize the Use of the Infrastructure and
  Technologies Developed at NSPO and Domestic
  Industry

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Mission Objectivesofthe ROCSAT-2 Program

• To Develop a Low-Earth-Orbit Satellite with the
  Associated Ground System for
• Observing Taiwan Island and Surroundings in a
  Near Real-Time Scale
• Conducting Scientific Research in the Area of
  Upper Atmosphere Lightning

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Mission Objectives ofRemote Sensing Instrument

• The ROCSAT-2 Satellite is Capable of Acquiring
  Image Data Throughout the Island with the
  Following Applications
• Agriculture and Forestry
• Natural Disaster Evaluation
• Urban Development and Land Use
• Environmental Monitoring
• Academic Researches and Education

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Mission Objectives ofImger of Sprites

• Investigation of the Electrodynamic Coupling
  Between Clouds and the Upper Atmosphere
• To Identify the Global Distribution of Red
  Sprites
• To Identify the Spatial-Temporal Dynamics of Red
  Sprites
• To Explore and Identify the UV-Band Content in
  the Activity of Red Sprites
• To Identify the Activity Degree of the Ionization
  of Red Sprites

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Overall Architectureofthe ROCSAT-2 Program
Space Segment
Orbit
Spacecraft
Remote Sensing Instrument
Communication Architecture
Launch Segment
Scientific Instrument
Receiving Station
TTC Station
Mission Objectives
Ground Segment
Back-Up TTC
Mission Operation
Data Processing
Users
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Operation Conceptsof theRemote Sensing
Instrument

• Mission Orbit
• Sun-Synchronous
• Height 891 Km
• Inclination 98.99º
• One Day Re-Visit of the island
• Equatorial Descending Time 930 am - 1030 am
  (TBR)
• Communication Architecture
• Tasking Agility
• Viewing Angle at Cross-Track ? 45º
• Viewing Angle at Pitch ? 45º
• Image Type Push-Broom

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Mission Orbit

• Parking 791 km, 98.99 deg

• Mission Orbit 14 rev/day, 891 km, 98.99 deg
• Swath gt 36 km Cross-Track Viewing Angel 45 deg

Mission Position
Parking Position
Taipei
Latitude (deg N)
Longitude (deg E)
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Comminication Architecture
10O E/V
Day
Night
AOS

• Image Data Downlink
• X-Band
• Data Rate ? 150 Mbps

• Imaging PAN and/or MSS Simultaneously
• Downlink PAN or MSS Data in a Near-Real Time

Receiving Station

• SOH Data Downlink
• Meet Existing S-Band Requirements
• Data Downlink Rate ?2Mbps

• Store and Dump Operation
• MSS data
• PAN data (Stereo Imaging and when Viewing Angel
  ? 30O)

Ground Track
Receiving Station
TTC Station
20O E/V (Real-Time Downlink Image Data when
Viewing Angel ? 30O)
LOS

• Ground Station Requirements
• 8m Dual Channel Antenna
• S-Band G/T ? 21.0_at_10OE/V. Angle (clear sky)
• X-Band G/T ? 26.7_at_20OE/V. Angle (clear sky)
• X-Band Image Data Downlink Rate ? 150Mbps

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Tasking Agility
Ground antenna elevation angle 10 deg
Ground Track
Multiple Strip Imaging
Look Backward
Pitch 30 deg
End Imaging
Rotation
FOR 45 deg
Stereo Imaging
Look Forward
Start Imaging
Tasking Agility Cross-track 30o/60sec
10o/25sec

Changing Viewing
Pitch - 45 degree
Duration 8.1 min
Basic Swath
Swath gt 36 km
Pitch 45 degree
1610 km
968 ??
Ground antenna elevation angle 20 deg
Complete three strips of different pitch roll
viewing
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Operation Conceptsof theImager of Sprites

• The Imager of Sprites will not be ON when Remote
  Sensing Instrument is Imaging
• The Imager of Sprites is Limb-Viewing the
  Altitude and Lateral Extent of Optical Emissions
  from Upper Atmospheric Lightning
• Viewing Direction Right-Hand Side Along with the
  ROCSAT-2 Mission Orbit
• One or Two Photometers Will be Used as a Trigger
  Source for the Imager of Sprites
• Viewing Area 1210 x 181.5 Km2 at a Distance 3467
  Km

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Summary (1)ofROCSAT-2 System Requirements
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Summary (2)ofROCSAT-2 System Requirements
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Summary (3)ofROCSAT-2 System Requirements
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Acquisition Strategy (1)ofthe ROCSAT-2 Program

• NSPO is the Overall System Integrator for the
  Complete ROCSAT-2 System, Including Spacecraft
  with Remote Sensing Instrument, Scientific
  Instrument, Ground System, and Launch Vehicle.
  Tasks to be Performed
• Define System Requirements
• Design the ROCSAT-2 System
• Define the Interface between Various Systems and
  Associated Requirements
• Validate End-to-End ROCSAT-2 System

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Acquisition Strategy (2)ofthe ROCSAT-2 Program

• The ROCSAT-2 Spacecraft will be Designed and
  Developed Jointly by Both NSPO and Contractors
  Engineers. NSPO will be Responsible for Certain
  Subsystems, e.g., Primary Structure and Thermal
  Control.
• NSPO will be Responsible for the Integration and
  Test of the Satellite by Using NSPO IT
  Facilities.
• Some Key Components and/or Subsystems will be
  Manufactured by Domestic Industry.
• Key Technologies of the EO Sensor will be
  Transferred to Precision Instrument Development
  Center (PIDC)

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Acquisition Strategy (3)ofthe ROCSAT-2 Program

• The Ground Station at National Central University
  will be the Primary Receiving Station for
  ROCSAT-2 Image Data. This Ground Station will be
  Modified to Meet Current System Requirements.
• NSPO will Establish a Back-up Image Data
  Receiving Station and Multi-Mission MOC to
  Operate ROCSAT-1, -2, and -3.
• NSPO will be Responsible for the Overall System
  Integration of Each Receiving Station when
  Modified.
• The Launch Service will be Small Class Launch
  Vehicle, e.g., Athena II, Rockot, Taurus-XL, and
  KOSMOS.

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Master Scheduleofthe ROCSAT-2 Program
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Current StatusofROCSAT-2 Program

• A Preliminary ROCSAT-2 RFP was Released to
  Potential Bidders.
• A Bidder Conference Will be Held at NSPO on July
  30-31.
• The RFP of ROCSAT-2 Spacecraft and Remote Sensing
  Instrument Will Be Released by the End of August
  1998.
• The SOW of the Imager of Sprites is Under
  Preparation.

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Concluding Remarks

• The Entire Work Mentioned in This Presentation
  Package Was Accomplished Independently by NSPO
  Engineering Team. The Team Has Completed the
  Mission Definition Document and System
  Requirements Document for the ROCSAT-2 System,
  and the Spacecraft RFP.
• The Results of This Effort Demonstrated the NSPO
  Technical Capability Has Been Established During
  the ROCSAT-1 Program.