Figure 12: Photo of the FPA (view from the sensor/baffle side), image credit: DLR 25), 450-900 nm Pan (Panchromatic) The agile spacecraft features a body pointing capability of ±45º into any direction (cross-track or along-track). The KOMPSAT-3 image (right) clearly shows the roofs of the buildings, cars on the road, and the ships and tide breakers along the shore. Legend to Figure 8: With 829.8 m, the Burj Tower is he tallest man-made structure in the world. - Focal length = 8.6 m The major goal of the KOMPSAT-3A program is to develop an earth observation satellite to obtain IR (Infrared) and high resolution EO (Electro-Optical) images for a variety of applications such as Geographical Information Systems (GIS), and environmental, agricultural and oceanographic monitoring as well as urban planning, resource management and disaster relief. 15) 16). 6), Table 1: Main parameters of the spacecraft. KOMPSAT 3 is an Earth observation mission of Korea Aerospace Research Institute (KARI), funded by Ministry of Education, Science and Technology (MEST) within the Korean government space development program. The imagery generated in EOS are transferred to the PDTS (Payload Data Transmission Subsystem) to be downlinked to Ground Station (GS) after compression, encryption, etc. Decenter The EOS architecture of AEISS is comprised of the following modules: OM (Optical Module) and CEU which in turn consists of the CEUP (CEU Power supply), CC (Camera Controller), and FPA (Figure 10). Legend to Figure 9: The image scene is of Jeodong Port on Ulleungdo Island, Korea. Legend to Figure 5: The Maracanã stadium (official name: Estádio Mário Filho, Maracanã being its neighborhood's name) in Rio de Janeiro (Brazil) is one of the biggest football stadiums in the world, and it is home of the four biggest football teams of Rio: Flamengo, Botafogo, Vasco da Gama and Fluminense. 17), • In January 2013, KOMPSAT-3 is still in the commissioning phase and should be operational soon. Throughout the launch phase and under variable on-orbit conditions, the instrument has to keep the following optical elements in place within tolerances of a few µm and µrad (Table 4): 5 mirrors, the FPA (Focal Plane Assembly) with 1 panchromatic and 4 multispectral bands, and two Star Trackers. KOMPSAT-3A is outfitted with three power-generating solar panels – each installed on two hinges on the aft deck of the satellite, allowing the panels to be deployed by two extendable booms that interface with the Equipment Module. This satellite agility permits event monitoring as well as single-pass stereoscopic observations. KOMPSAT-3 provides 0.7m panchromatic and 2.8m multispectral imagery. The CC (Camera Control) unit of CEU communicates with the spacecraft OBC via a MIL-STD-1553B interface. 12). 18), • In November 2012, KARI awarded SI (Satrec Initiative)of Daejeon, Korea a contract as the 'worldwide exclusive representative' for KOMPSAT imagery sales. • A folding flat mirror (M5), for reasons of overall volume limitations. - TDI (Time Delay Integration), up to 64 TDI in 4 stages - 2.8 m for MS bands at nadir, - Line array of 24,000 pixels consisting of 2 stacks of 12 k pixels each - Source data rate = 4 x 240 Mbit/s, Table 2: Performance parameters of the AEISS instrument. The IRPE provides the capability to receive and store KOMPSAT-3 data, support to collection planning, generate standard and value added imagery products, and distribute imagery products to users. SI developed the IRPS (Image Reception and Processing Station). 3 m /30 km KOMPSAT-3 - CSCDA (Copernicus Space Component Data Access) KOMPSAT-3 KOMPSAT-3 is a Korean remote sensing satellite, which provides 0.7 m GSD panchromatic image and 2.8 m GSD multi-spectral image data for various applications including visual … The IRPE provides the X-band reception interface from the satellite. 19), Figure 8: Image of the Burj Tower of Dubai, observed by KOMPSAT-3 in the fall of 2012 (image credit: KARI). There are two major subsystems to AEISS: EOS and the OM (Optical Module) with the telescope. - Source data rate = 16 x 15 Mpixel/s (or 3.84 Gbit/s), - Line array of 6,000 pixels, provision of 8 stacks, TDI capability EOS features also a focus mechanism for the best focusing and combined active/passive thermal control mechanism to take images at the best temperature condition. The uniform light source provides known radiance levels with absolute accuracy traceable to the NIST (National Institute of Standards and Technologies) or equivalent primary standards of radiance scale. - SI developed OBC (On-Board Processor) module with reliable RTOS and high-end CPU. 520-600 nm MS2, green The IRPS consists of four subsystems; • ICPS (Image Collection Planning Subsystem). The CEUP and CC modules are actually part of the spacecraft bus, while the FPA is integrated with OM to constitute EOS. Each FPM consists of a CCD module and spectral filters and FPE (Focal Plane Electronics). The primary payload on this flight was GCOM-W1 (Global Change Observation Mission - Water 1) of JAXA (nickname: Shizuku) with a launch mass of ~ 1990 kg. The objective is to provide observation continuity from the KOMPSAT-1 and KOMPSAT-2 missions to meet the nation's needs for high-resolution optical imagery required for GIS (Geographical Information Systems) and other environmental, agricultural and oceanographic monitoring applications. 760-900 nm MS4, NIR (Near Infrared), - Korsch-type telescope design on a CFRP optical bench It includes: • An on-axis Cassegrain telescope with a primary mirror (M1 concave) and a secondary mirror (M2 convex), • A tertiary off-axis mirror (M3 concave off-axis), • An on-axis M4 aspherical concave mirror. The deployment mechanism is based on an earlier patented design by SpaceTech exhibiting very low friction, high torque margin and at the same time low deployment shock through a cam/spring driven system. The CEU architecture is shown in Figure 13. 1) 2) 3), SI (Satrec Initiative) of Daejeon participation in the KOMPSAT-3 development of KARI: 4) 5). SESO activities did also include the mechanical design, manufacturing and mounting of the attachment flexures between the mirrors, the integration on the CFRP (Carbon Fiber Reinforced Plastics) baseplates, and the environment tests of the 5 mirrors. The project was started in 2004. Figure 15: Cross-section of the optical system (image credit: SESO), Distance to Focal Plane - Pixel pitch = 8.75 µm A CTE of zero fits well with mirrors made of Zerodur, so that the telescope becomes insensitive not only against temperature changes, but also against temperature gradients. 26), Figure 14: Illustration of the AEISS telescope with EOS and star trackers (image credit: KARI, EADS Astrium), SESO (Société Européenne de Systèmes Optiques) of Aix en Provence, France was awarded a subcontract for the manufacturing of the whole set of telescope mirrors (5 mirrors, 2 flight models). The building officially opened on January 4, 2010. PADS is a software package which performs precision attitude determination by using precise orbit data and attitude sensor data (star trackers and gyros). Figure 2: System architecture of the KOMPSAT-3 mission (image credit: KARI), Figure 3: Photo of the KARI KOMPSAT-3/Arirang-3 spacecraft at TNSC on May 1, 2012 (image credit: The Korea Herald), Launch: The KOMPSAT-3 (Arirang-3) spacecraft was launched as a “co-payload” on May 17, 2012 (16:39 UTC) from the Tanegashima Space Center of JAXA, Japan on the H-IIA launch system. CEU (Camera Electronics Unit): The CEU manages the overall operation of EOS; hence, it defines the functionality and operational capabilities of EOS which implies also the performance of the FPA. The contract also included the delivery of stiffening mechanism for each of the solar arrays, to achieve a high eigenfrequency of the solar array wings in order to allow agile satellite operation/pointing. A further goal is to meet the nation’s satellite demand and form a technology infrastructure that will make inroads into the world space industry at a stage when the industry is improving the capability to design and develop highly advanced remote sensing satellites. Figure 6: KOMPSAT-3 sample image capture of the Pentagon (image credit: Satrec Initiative, KARI), • April 8, 2013: KARI (Korea Aerospace Research Institute) has announced the start of commercial services of KOMPSAT-3 after in-orbit validation on 29 March, 2013. The UIS is to process ‘Product Order’ of the External User. The mission is funded by MEST (Ministry of Education, Science and Technology). KOMPSAT-3 has a unique local access time of 13:30 hours, and the imaging capability in the afternoon will increase the chance of acquiring cloud-free images over specific targets for the end users. The MCE provides the mission planning and satellite command, control functions that allow the operators to perform the mission, and maintain the health of the satellite.
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