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Poster Session 4
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Thai Remote Sensing Satellite System
2.2 Ground Segment
The Ground Segment comprises two main system:
- the Mission Control Center (MCC) :
The role of the Mission Control Center (MCC) is to accept request for image data, plan the operations of the satellite, control, coordinate and execute the planed operations, tack end-to-end operations and monitor data quality. The MCC has the authority required for day-to-day mission operations and control, and the responsibility for ensuring that the mission objectives are satisfied. The MCC undertakes and coordinates implementation of the overall mission by monitoring, directing and controlling all mission aspects and resources.
- the Data Processing Facility (DPF)
The system is capable of processing raw satellite data, received by the X-Band Data Reception station, into high quality image products in either film or CCT formats. The products produced are geocoded and georeferenced and presented in the form of 185 km x 185 km images.
2.3 Space Segment
The Space Segment comprises a Spacecraft bus and an instrument.
- The Spacecraft Bus
The Spacecraft structure is a modular configuration comprises Bus and Propulsion modules. The Spacecraft protects against "credible" single point failures by using full redundancy, space qualified hardware, cross-strapping, and backup modes. The propulsion subsystem uses monopropellant hydrazine. The Telemetry, Tracking & Control subsystem includes a Digital Storage Unit, which may be hosted in the Integrated Avionics Processor for storage of housekeeping data and S-Band transponders for command uplink and housekeeping data downlink. The power subsystem implementation consists of a deployable, non-articulated solar ., array for primary power operating in conjunction with a nickel hydrogen (NiH2) battery for energy storage with a redundant cell. The thermal subsystem combines both passive and active elements to maintain the spacecraft temperatures within acceptance limits during normal operation, and within survival limits during emergency modes. The Attitude Determination and Control Subsystem is a zero net momentum implementation using magnetorquers and reaction wheels as actuators, and sun sensors, horizon scanners, and magnetometers as sensors. The thrusters are used to control orbit maneuvers.
- Instrument
The instrument mounted on the Spacecraft Bus, contains a Visible and Near Infrared (VIS/NIR) pushbroom camera. A data formatter configures the image data for relay to the ground station via the X-Band downlink
2.4 Launch Segment
The launch segment comprises the launch element, the Low Earth Orbit Phase network, and launch services.
The launch element comprises a Pegasus XL launch vehicle, an on- board monopropellant system, and the required propellant. The necessary launch support equipment for integration, handling, shipping and launch operations is also part of the element. The selected launch element meets all of the specified requirements and is consistent with the standard proven procedures of the Pegasus launch system and the Eastern Test Range.
3. Conclusion
Thai Remote Sensing Satellite System will be launched in the next few years, which will not only benefit Thailand but would also provide new opportunity for international collaboration.
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