• Journal of Satellite, Information and Communications
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• v.11 no.3
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• pp.92-99
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• 2016

AIS(Automatic Identification System) is an vessel traffic management system which exchanges vessel data with other nearby ships, AIS base stations using VHF band. A domestic AIS base station is located along coast lines or island. So it is difficult to collect vessel data from the ocean. To solve this problem, we adopted AIS payload on the low earth orbit satellite. The AIS payload on the satellite is interfaced with OBC(On-Board Computer) via UART and the FSW(Satellite Flight Software) manages it. The FSW have to receive AIS command from ground station and forward to AIS payload. Similarly FSW have to receive response, OBP, OGP data from AIS payload and it is downlink to the ground station. So in this paper we describe the FSW design & implementation for AIS payload.

• Journal of Satellite, Information and Communications
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• v.11 no.3
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• pp.65-71
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• 2016

Currently developing the OBC of the next-generation LEO satellite by Korea Aerospace Research Institute adopts the LEON2-FT/AT697F processor to achieve high performance. And various communication devices such as SpaceWire, MIL-STD-1553B, DMAUART and CAN Master are integrated to the separated standard communication FPGAs within the OBC, where they can be controlled by the processor and flight software (FSW) through PCI interface. The Actel 1553BRM IP core is used for the 1553B in the next-generation LEO OBC and the B1553BRM wrapper from Aeroflex Gaisler is used for connecting it to the AMBA bus in FPGA. This paper presents the design and development of PCI-based 1553B communication software, and describes the handling mechanism of 1553B operation in FSW task level. Also it shows the test results on real-hardware and simulator.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10c
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• pp.547-549
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• 2003

위성의 개발 및 제작에는 많은 비용과 기간이 소요되며. 일반적으로 사용되는 장비들과는 전혀 다른 우주환경에서 임무를 수행하게 된다. 그리고 위성의 경우에는 발사이후에 발생하는 오류들을 수정하는 것이 거의 불가능하므로 위성의 성공적인 임무완수를 위해서는 철저한 사전검증 작업들이 필요하게 된다. 특히, 위성의 궤도, 자세를 제어하고 실제적인 임무수행을 관할하는 위성탑재소프트웨어에 대한 완벽한 검증이 필요하다. 이러한 소프트웨어의 통합 및 조립시험. 검증시험을 위해 저궤도 위성의 FSW(Flight Software) 개발단계에서 실제 위성시스템과 유사한 인터페이스를 제공하는 개발도구인 STB(Software Test Bed)가 제작되며, 제작된 STB를 통한 FSW의 검증시험 및 분석을 지원하기 위한 구문분석프로그램으로 VTSP(Verification Test Script Parser)를 개발하게 된다. 본 논문에서는 이러한 STB와 VTSP에 대한 전반적인 소개와 함께 개발된 STB와 VTSP를 이용하여 실제 위성탑재소프트웨어를 검증하기 위한 시험환경에 대해 알아보고자 한다.

• Aerospace Engineering and Technology
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• v.11 no.2
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• pp.49-56
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• 2012

LEO Satellite performs the operations and missions by FSW(Flight Software) after separation from a launch vehicle. Many of the operations by FSW are automatically conducted by the algorithms of FSW. In the case of the IAC(Initial Activation and Checkout) operations, a mission scheduling, an orbit transition, etc, however, a decision and a control of the satellite operators or manufacturers are required in order to operate the satellite safely. For this, the wireless communication channel between a satellite and a ground station should be prepared to receive telemetries and to transmit tele-commands for controlling FSW properly. Therefore, the verification of the interface between KOMPSAT-3 and a ground station is essential. This verification test is named the satellite end-to-end test. In this paper, we show the design process of the satellite end-to-end test and test results.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2003.05a
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• pp.70-74
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• 2003

Recently, many kinds of satellites are developed in many countries. The satellite contains various data, such as hardware status data attitude date an information, etc. And the ground station must check these data for successful operation These data is called as telemetry. Flight software is responsible for the telemetry processing. In KOMPSAT(Korea Multi-Purpose Satellite)-2, the telemetry processing logic takes the table-driven method to make satellite data flow efficient In this paper, the telemetry processing in KOMPSAT-2 is described Verification test and integration test are being carried out for the FSW of KOMPSAT-2.

• Aerospace Engineering and Technology
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• v.10 no.2
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• pp.105-113
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• 2011

During the development of flight software, the processor emulator and satellite simulator are essential tools for software development and verification, which can be substituted for the actual hardware. LEO satellites being developed by KARI recently use the MCM-ERC32SC processor for on-board computer (OBC). For the flight software (FSW) development and testing, the software-based spacecraft simulator was developed using TSIM-ERC32 processor emulator from Aeroflex Gaisler. It is needed to get rid of the constraints and dependencies of TSIM-ERC32 processor emulator and to obtain high performance processor emulator to develop full satellite simulator. This paper presents the development of the ERC32 emulator based on open source dynamic translator, QEMU, as the first step. And it describes the software development and testing/debugging on the developed emulator.