• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.448-451
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• 2004

MSC (Multi-Spectral Camera) system is an electro-optical camera system which is being developed to be installed on KOMPSAT-2 satellite. High resolution image data from MSC system will be transmitted to the ground-station through x-band antenna called APS (Antenna Pointing System). APS is a directional antenna which will point to the receiving antenna at ground station while the satellite is passing over it. The APS needs to be controlled accurately to provide the reliable communication with big RF link margin. The APS is controlled by ATS (Antenna Tracking Software) which is included in the MSC software. ATS uses the closed loop control algorithm which will use TPF (Tracking Parameter File) as an input for antenna position, and will use two resolve readings from APS as a feedback. ATS has been developed and verified using APS QM (Qualification Model) and all the control parameters for ATS have been tested and verified. Various kinds of maximum, nominal and realistic dynamics for the APS movement have been simulated and verified. In this paper, closed loop servo control algorithm and obtained APS position error from the verification test with APS QM will be presented in detail

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.440-443
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• 2004

As a main management unit of MSC, PMU controls the MSC payload operation by issuing commands to other subunit and PMU internal modules. One of these main control functions is to drive the APS(Antenna Pointing System) when APS motion is required. For this purpose, SBC(Single Board Computer) for calculating motor commands and APDE for driving APM(Antenna Pointing Mechanism) by PWM signal operate inside PUM. In this paper, details on APDE design shall be described such as electronic board architecture, primary and redundant design concept, Cross-Strap, FPGA contents and latch-up immune concept, etc., which shall show good practices of electronic board design for space program.

• 항공우주기술
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• 제4권1호
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• pp.221-228
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• 2005

본 기술 논문에서는 아리랑 2호 APS의 안정적인 운용 및 TPF의 정밀도와 관련하여 궤도예측 시스템의 예측오차를 분석하였다. 본 논문에서는 보다 실제적이고 정확한 성능 및 오차 분석을 위하여 아리랑 2호 정상 운용 및 예상되는 연장 운용 시기와 유사한 태양활동을 보인 기간 동안의 아리랑 1호 실제 데이터를 이용하여 궤도결정 및 예측을 수행하였다. 본 기술 논문의 결과들은 아리랑 2호 APS와 지상 X-Band 수신국 간의 인터페이스 문서에서 할당된 "지상 궤도예측 정밀도"에 대한 분석 및 검증 자료로 활용될 수 있으며, 아리랑 2호 APS의 안정적인 운용에 중요한 참고 자료가 될 것으로 사료된다.