Moon Hee You

Integration, testing and in orbit validation of Ka-band communication payload of COMS

COMS (Communication, Ocean and Meteorological Satellite) named Chunrian is aimed to develop domestic space proven technology of Ka-band switching transponder and multi-beam antenna technologies, and to exploit advanced multimedia communication services. This paper is purposed to study development design, manufacturing and test technology of Ka-band payload system, and to verify outstanding technology level through ETRI project.

In orbit pattern tests of COMS satellite antennas

ETRI, KARI and Astrium have developed unique Communications, Ocean and Metrological Satellite - COMS to incorporate both Communications and earth observation from single satellite. COMS was launched by Ariane-5 on 26th June 2010 and arrived successfully to operational geo-stationary orbit 128.2°E. It features a multi-beam Ka-band Communications package, a set of equipments to study Ocean Ecosystem to aid the fishing industry and a Metrological weather observation system. The multi beam Ka-band antenna IOT campaign was conducted by Kari/Astrium/ETRI team supported by Telesat Canada. A brief outline on functional and operational capability including software and hardware used for in orbit test validation of Ka-Band antenna system is addressed

An Assessment of the BER Performance of the COMS Ka - Band Satellite Communications System

[Abstract] The Ka -band communication payload in the COMS satellite communication sy stem(SATCOM) will provide high -speed multimedia services in the public communications network and communication services for disaster relief in the government communications network. For the evaluation of the design results for the COMS Ka -band payload in end -to -end communication system point of view, it is necessary to access the effect of the RF performances degradation of the overall system BER performance . In this paper, the designed critical major parameters ( spurious outputs, phase noise and TWTA indu ced AM/PM and AM/PM ) are evaluated how to affect QPSK system BER performance. I. Introduction HE Ka -band on -board switching communication payload is a part of the Communication, Oceanographic, and Meteorological Satellite (COMS) to be located in geostationa ry orbit in 2009. It will provide high -speed multimedia services such as Internet via satellite, remote -medicine, and distance learning in the public communications network and communication services for disaster relief such as prediction, prevention, and recovery services in the government communications network. It has three(3) channels and each channel has 100MHz bandwidth. Also it covers the Korean Peninsula with the three(3) separated spot beams. For the successful service launch, the quality of servi ce (QoS) of the designed system must be evaluated. One way to measure the QoS in a broadband data communication using satellite is the achievable average bit error rate (BER). Considering the relatively high data rates ranging from 56 Kbps 155 Mbps using t he coherent M -PSK modulations, the required BER should be lower than 10