Thailand Earth Observation System (Theos) Development Program

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The 2nd Asian Space Conference, Hanoi, Vietnam, 8-11 November 2005

Thailand Earth Observation System (THEOS) Development Program Puwadon Kongseri, et al.
Satellite Development Division Thailand Earth Observation System Development Program Geo-Informatics and Space Technology Development Agency (Public Organization) (GISTDA) puwadon@gistda.or.th

Abstract
Thailand Earth Observation System (THEOS) Development Program was begun in July 2004. The program is developed by Geo-Informatics and Space Technology Development Agency (Public Organization) (GISTDA) under the Ministry of Science and Technology, with European Aeronautic Defence and Space Company – Astrium (EADS Astrium SAS), in France, as a prime contractor. It consists of design, development, test, launch, and commissioning phases of THEOS satellite, as well as integration with associated control and data exploitation ground facilities. This paper gives an overview of system architecture, satellite architecture, its performance and main applications, as well as technology transfer and trainings for Thai engineers and operators. THEOS satellite is a compact and agile satellite with a mass of 750 kilograms and a power consumption of 800 Watts. It has two push-broom scanning optical instruments, providing worldwide imagery in Panchromatic and Multispectral modes, covering the Visible and Near Infrared spectrum. The Panchromatic instrument has a resolution of 2 metres and a swath width of 22 kilometres. The Multispectral instrument has a resolution of 15 metres and a swath width of 90 kilometres. The satellite will be launched into a sun-synchronous low earth orbit in July 2007 and will have a design lifetime of at least 5 years. 1. Introduction After many years of using remote-sensing data from foreign satellite systems, Thailand has decided to have its own earth observation satellite system for rapid and sustainable country development. Thailand Earth Observation System (THEOS) Development Program was then begun in July 2004. The program is developed by Geo-Informatics and Space Technology Development Agency (Public Organization) (GISTDA) under the Ministry of Science and Technology, with European Aeronautic Defence and Space Company – Astrium (EADS Astrium SAS), in France, as a prime contractor. THEOS system, which is fully owned by Royal Thai Government, will be operated by GISTDA.

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The 2nd Asian Space Conference, Hanoi, Vietnam, 8-11 November 2005

2. Architecture of THEOS System THEOS system is a stand-alone earth observation system. The architecture of THEOS system has been developed in order to satisfy needs and requirements from GISTDA, Ministry of Science and Technology, as well as other relevant Ministries and imagery users in Thailand. These requirements include resolutions, swath width, coverage area, revisit frequency, as well as image quality and applications. THEOS system comprises of the following main constituents, as shown in Figure 1. THEOS Satellite (Space Segment) Ground Facilities (Ground Segment) • • Control Ground Segment (CGS) Image Ground Segment (IGS)

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Figure 1: Architecture of THEOS System

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The 2nd Asian Space Conference, Hanoi, Vietnam, 8-11 November 2005

3. Performance of THEOS Satellite The payloads of THEOS Satellite are Panchromatic and Multispectral pushbroom scanning optical instruments. The radiometric and spatial performances of the instruments have been optimised between resolutions and swath width in order to satisfy imagery application requirements in Thailand. The spectral range of each imagery band of Panchromatic and Multispectral instruments is shown in Table 1 and Figure 2. Table 1: THEOS Spectral Bands Name PAN B0 B1 B2 B3 Band Panchromatic Multispectral / Blue Multispectral / Green Multispectral / Red Multispectral / Near-Infrared Band Width 0.45 - 0.90 µm 0.45 - 0.52 µm 0.53 - 0.60 µm 0.62 - 0.69 µm 0.77 - 0.90 µm

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PANCHROMATIC B0 BAND B1 BAND B2 BAND B3 BAND WHITE LIMESTONE

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