• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.35 no.4
• /
• pp.347-352
• /
• 2007

This paper describes the design and implementation of PFM(Proto Flight Model, PFM) of DRE(Data Receiving Equipment, DRE) for Science and Technology Satellite 2(STSAT-2) and the results of integration performance test. DRE components are X-band receiver, DCE(Data Combine Equipment, DCE) and RAC(Receiving and Archiving Computer, RAC). DCE consists of I&Q data combiner and ECL signal distributor. RAC consists of DRC(Data Receiving Card) and ST2RAS(STSAT-2 Receiving and Archinving Software). X-band receiver receives 10Mbps QPSK I, Q satellite data and sends the data to DCE. DRC stores the I&Q combine data from DCE to RAID. The pre-processing program sorts and stores to satellite status data and payload data. The performance of DRE in the functional and space environments test satisfies the requirements of STSAT-2.

• Bulletin of the Korean Space Science Society
• /
• 2004.04a
• /
• pp.90-90
• /
• 2004

과학기술위성 1호는 2003년 9월 27일 성공적으로 발사된 후 초기 운용 과정을 거친 이후 탑재체의 정상적인 운용에 들어갔다. 과학기술위성 1호에 실린 탑재체는 원자외선 분광기, 우주물리 관측기, 자료수집 시스템 등이 있으며, 탑재체에서 발생된 데이터는 X-band 대역의 RF 시스템인 PDTx를 통해 지상으로 전송된다. 최근의 위성 운용에 의하면 하루 평균 수신량은 원자외선 분광기와 우주 물리 관측기의 자료가 약50Mbyte이며, 수신된 자료는 탑재체팀의 서버로 전송되어 사용자가 데이터를 처리할 수 있도록 되어 있다. (중략)

• Bulletin of the Korean Space Science Society
• /
• 2004.04a
• /
• pp.91-91
• /
• 2004

과학기술위성 1호의 탑재체는 원자외선 분광기(FIMS), 우주물리 관측기(SPP), 자료수집 시스템(DCS), 그리고 고정밀 별감지기(NAST)가 있으며, 우주물리 관측기는 저에너지 검출기(ESA), 고에너지 검출기(SST), 랑마이어 탐침(LP)과 자기력 측정기(SMAG) 등 4개의 센서로 구성되어있다. 위성에 탑재된 각각의 관측기는 운용시 발생되는 데이터를 위성의 대용량 메모리 시스템에 저장되며, 위성이 한반도 상공을 지나는 교신구간에 X-Band 대역의 RF를 통하여 지상으로 전송된다. (중략)

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.50 no.8
• /
• pp.573-581
• /
• 2022

This paper deals with the development of CanSat system, which ejects two maple seed-type autorotating science payloads and collects weather information. The CanSat consists of two autorotating science payloads and a container. The container is equipped with devices for launching science payloads and communication with the ground station, and launches science payloads one by one at different designated altitudes. The science payload consists of a space for loading and a large wing, and rotates to generate lift for slowing down the fall speed. Specifically, after being ejected, it descends at a speed of 20 m/s or less, measures the rotation rate, atmospheric pressure, and temperature, and transmits the measured value to the container at a rate of once per second. The communication system is a master-slave structure, and the science payload transmits all data to the master container, which aggregates both the received data and its own data, and transmits it to the ground station. All telemetry can be checked in real time using the ground station software developed in-house. A simulation was performed in the simulation environment, and the performance of the CanSat system that satisfies the mission requirements was confirmed.

• Aerospace Engineering and Technology
• /
• v.6 no.1
• /
• pp.245-254
• /
• 2007

The on-board telemetry system of KSLV-1 transmits telemetry signal for the launch vehicle and satellite to ground telemetry system in real time. In ground telemetry system, antenna system acquires telemetry signals and transfers these to data processing system. Data processing system processes and recordes telemetry data and distributes it to each mission operator in order to monitor it the operation goes well or not. This document describes the configurations and functions of data processing system designed for efficient and appropriate processing of telemetry data.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.37 no.12
• /
• pp.1258-1263
• /
• 2009

This paper describes the design and test results of engineering qualification model(EQM) of mass memory unit(MMU) for STSAT-3. The MMU for STSAT-3 having 32Gb mass memory capacity is capable of receiving and transmitting the mission data from MIRIS(Multi-purpose IR Imaging System) and COMIS(Compact Imaging Spectrometer) at 100Mbps and 10Mbps. The performance of EQM MMU was verified by the tests of data receiving from two payloads and data transmission to the data receiving system. Moreover, the vibration and thermal vacuum test was performed to verify the launch vehicle and space environments.

• Proceedings of the Korean Information Science Society Conference
• /
• 1998.10a
• /
• pp.42-44
• /
• 1998

위성 시스템은 전력 분배, 자세 제어, 열 제어 및 임무 수행에 필요한 탑재체 지원과지상과의 명령 수신 및 측정데이터의 수집을 위해서 프로세서를 내장하고 있다. 임무 수행 및 시스템의 복잡성 여부에 따라서 하나의 프로세서만을 탑재하기도 하지만 여러 개의 프로세서를 탑재하여 기능에 적합하게 분배하여 운용하기도 한다. 아리랑위성은 3개의 프로세서사 탑재되며, 크게 나누어 원격 측정 명령계, 자세 제어계 그리고 전력계에 기능을 담당하게 된다. 하나 이상의 프로세서를 탑재하게 되면 프로세서간의 동기화가 요구되며 프로세서간의 정보 전달을 위해서 통신 채널이 필요하게 된다. 실제로 프로세서간의 동기화는 상호 통신에 있어서 기준 점을 제공하므로 매우 중요한 의미를 가진다. 본 논문에서는 아리랑위성의 동기화는 어떤 방식으로 설계되었으며, 어떻게 운영되는지에 대해 설명한다.

• Korean Journal of Remote Sensing
• /
• v.26 no.2
• /
• pp.263-275
• /
• 2010

KOSC(Korea Ocean Satellite Center), the primary operational organization for GOCI(Geostationary Ocean Color Imager), was established in KORDI(Korea Ocean Research & Development Institute). For a stable distribution service of GOCI data, various systems were installed at KOSC as follows: GOCI Data Acquisition System, Image Pre-processing System, GOCI Data Processing System, GOCI Data Distribution System, Data Management System, Total Management & Control System and External Data Exchange System. KOSC distributes the GOCI data 8 times to user at 1-hour intervals during the daytime in near-real time according to the distribution policy. Finally, we introduce the KOSC website for users to search, request and download GOCI data.

• Aerospace Engineering and Technology
• /
• v.10 no.1
• /
• pp.107-115
• /
• 2011

The line-telemetry data processing system is necessary for monitoring the status of each onboard systems of KSLV-I upper stage during the ground tests and launch preparation. The mission of line-telemetry system is to provide reference telemetry data and to monitor the status of upper stage. The line-telemetry data processing system consists of a PCM acquisition/processing server, a system management server, and 9 monitoring consoles. In this paper, we will describe the overview of onboard remote measurement system, the design of the line-telemetry data processing system, anomaly setup information for indicating alarm signal in case of abnormal occurrence, and the result of the ground test and flight test.

• Journal of Space Technology and Applications
• /
• v.2 no.2
• /
• pp.121-136
• /
• 2022

Automatic Identification System used in ship communication is required for marine control way, including monitoring of vessel operation in coastal and exchanging of information for safety navigation between them. But, it uses a very high frequency band of approximately 160 MHz, and at the same time, due to the curvature of Earth, there is a limit to the communication distance. Several demonstrations were made successfully over satellite, but not much work has been done yet through cube-satellite which has low-orbit at 500 km altitude. Here, we demonstrate a reception test of AIS (automatic identification system) receiver for a cube-satellites using software-defined radio (SDR). We collected AIS data from ship at port of Busan, Korea, using R8202T2 SDR and established to transmit them using Adam-Pluto and Matlab Simulink. The process of weakening the signal strength to a satellite was constructed using attenuator. Through above process, we demonstrated whether AIS data was successfully received from the AIS payload.