The KOMPSAT-2 has been being operated over 5 years since it was launched at July, 2006, and KOMPSAT-3 & 5 will be launched sooner or later. A mission orbit of KOMPSAT-2 & 3 is 685km sun-synchronous with a 28-day ground repeat cycle. The KOMPSAT-5 is the first synthetic aperture radar satellite of South Korea, and its mission orbit is 550km sun-synchronous dawn-dusk orbit with a 28-day ground repeat cycle. The mission of KOMPSAT series collects earth images like ocean and land management, and disaster and environment monitoring. The MSC (Multi Spectral Camera) of KOMPSAT-2 collects 1m of panchromatic and 4m of multi-spectral images, the AEISS (Advanced Earth Image Sensor System) of KOMPSAT-3 collects 0.7m of panchromatic and 2.8m of multi-spectral images, and the SAR (Synthetic Aperture Radar] of KOMPSAT-5 has three operation modes including high-resolution, standard, and wide-swath, and its image resolutions in dedicated swaths are 1 m, 3 m, and 20 m, respectively. The overseas ground stations will be used in order to increase contact time between the KOMPSAT series and the KGS (KARI Ground Systems). A role of overseas ground stations is to track a signal, receive telemetry in real time and to send bent-piped commands, also to be used in case of the satellite contingency during the normal operations and LEOP. Now that the KGS has to ready for manage overseas ground stations for KOMPSAT series in the concept of multi-satellite operations simultaneously, MTGI (Multi TMTC Gateway Interface) tool is developed. Functions of MTGI are routing, telemetry receiving, command transmitting, and file format converting. Consequently, we are able to ready for the multi satellite operation through MTGI. This paper will show interface concept of oversea ground stations and its function, and interface concept of KGS will be revised during operations of KOMPSAT-3 & KOMPSAT-5.
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