[논문]천리안 위성 Ka 대역 통신탑재체시스템 기술

이성팔; 조진호; 유문희; 최장섭; 안기범

천리안 위성 Ka 대역 통신탑재체시스템 기술
Ka band Communication Payload System Technology of COMS 원문보기

통신위성우주산업연구회논문지 = The Journal of Korea Society of Communication and Sapce Technology, v.5 no.2, 2010년, pp.75 - 81

이성팔 (한국전자통신연구원 위성무선융합연구부) , 조진호 (한국전자통신연구원 위성무선융합연구부) , 유문희 (한국전자통신연구원 위성무선융합연구부) , 최장섭 (한국전자통신연구원 위성무선융합연구부) , 안기범 (한국전자통신연구원 위성무선융합연구부)

초록
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통신해양기상위성은 4개 정부부처 공동사업으로, 통신서비스, 해양기상 관측서비스를 7년간 제공하게 된다. 위성 스위칭 중계기와 다중빔 안테나로 구성된 Ka 통신탑재체 개발은 방송통신위원회 출연으로 ETRI 주관으로 개발하였으며, 통신탑재체 개발목적은 우주인증 기술확보와 차세대 멀티미디어 위성서비스 개발이다. 본 논문 목적은 통해기 통신탑재체 국산 개발사업의 전 과정을 통한, ETRI 의 Ka대역 통신탑재체 개발기술 연구이며, 또한 통신탑재체 응용 기술에 대해 다루고자 한다.

Abstract ▼ AI-Helper

COMS (Communication, Ocean and Meteorological Satellite) is the multi-purposed Korean geostationary satellite funded by four Korean government ministries, and is to supply communication services, ocean and weather observation for 7 years. As part of COMS, development of Ka band communication payload composed of microwave switching transponder and multi-horn antenna is sponsored by KCC (Korea Communications Commission) and developed by ETRI (Electronics and Telecommunications Research Institute). The purpose of Ka Payload development is to acquire space proven technology of Ka payload and to exploit advanced multimedia communication services. This paper aims to study development technology of Ka payload system through whole process of ETRI project. Also application of Ka payload will be dealt in this paper.

주제어

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문제 정의

The purpose of the antenna near field measurement is to verify the electrical RF alignment of the antenna beams with respect to the spacecraft reference coordinate system at ETRI facility. The antenna range test is conducted to measure radiation performance of antenna, such as patterns, polarization, gain, cross-polarization, side-lobes etc.

제안 방법

Acoustic test was conducted to simulate launch load condition. Low level acoustic surveys were conducted before and after test to detect any structural failure or degradation of Ka band payload.
After that, test was performed at the level of "integrated system" to verify satellite electrical performance prior to environmental exposures: complementary functional tests to check the integrity of both bus and payloads and to cover modified hardware and interfaces during payloads/bus mating; a conducted EMC was performed to measure the spacecraft performances.
ETRI with domestic technologies successfully developed Ka payload equipments and system throughout design, manufacturing and test. ETRI completed IOT (In Orbit Test) of Ka Payload and verified the final status of the Payload located at GEO in 128.2 E. IOT test result of Ka Payload is compliant with specification and same as that of Thermal Vacuum Test done at ground test.
Ka-band Payload IOT was performed in two parts, Antenna Pattern Measurements (APM) and payload RF Performance Measurements. Ka payload configuration change was done by KARI SOC (Satellite Operation Center) according to ETRI request and Ka-band telemetry was forwarded to IOT operation center at ETRI. The overall Ka Payload IOT configuration is shown in Figure 8.
Ka-band Payload IOT was performed in two parts, Antenna Pattern Measurements (APM) and payload RF Performance Measurements. Ka payload configuration change was done by KARI SOC (Satellite Operation Center) according to ETRI request and Ka-band telemetry was forwarded to IOT operation center at ETRI.
The RF auto-compatibility test was performed in large EMC chamber at Intespace in Toulouse. The purpose of the test is to check RF interference level between payloads in COMS in normal operation condition. The threshold level was -65dBc as in-band spurious specification.
The sine vibration test was conducted in x, y and z-axes with the flight level. A low level vibration survey was conducted to measure natural frequency.

대상 데이터

(Korean Time). It was stationed at GEO 128.2E.
The antenna consists of two(2) single offset reflector configuration. The antenna structure consists of reflector with backing rib structure and brackets to accommodate deployment mechanism and hold down and release mechanism.

이론/모형

The purpose of CATR measurement is to verify the RF alignment of the antenna beams with respect to the spacecraft reference coordinate system at spacecraft level. Gain pattern measurements were performed base on the gain comparison method by using standard gain horn. The Tx & Rx co-pol patterns of the East and West antennas show that the beams are pointing in the required direction and are relatively well centered on their respective coverage.

참고문헌 (4)

SP Lee, "Development of Satellite Communication System for COMS", Proceedings of APSCC pp. 71-96, 2004.
JH Lee, JH Kim, SP Lee, HJ Lee, "Multi-beam Satellite Antenna Design", IEEE International Symposium on Antenna and Propagation and USNC/URSI National Radio Science Meeting, Session 84, July 2004.
JS Choi, YD Lee, SP Lee, "Development of Ka band Multibeam Antenna", 13th Ka and Broadband Communications Conference, K000055, 2007.
JS Choi, YD Lee, SP Lee, "CATR Test for Ka band Multi-beam Antenna", 26th International Communications Satellite Systems Conference (ICSSC), June 2008, AIAA 2008-5511)

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천리안 위성 Ka 대역 통신탑재체시스템 기술
Ka band Communication Payload System Technology of COMS 원문보기

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천리안 위성 Ka 대역 통신탑재체시스템 기술 Ka band Communication Payload System Technology of COMS 원문보기

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이성팔 (49) 조진호 (10) 유문희 (14) 최장섭 (9) 안기범 (2)

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천리안 위성 Ka 대역 통신탑재체시스템 기술
Ka band Communication Payload System Technology of COMS 원문보기

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