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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Sep.; 25(9), ISSN (Print) ISSN X (Online) A Study of Radio-Wave Interference on Location Selection of Satellite Ground Stations 양재수 배상수 황유민 김진영 Jae Soo Yang Sang Soo Bae* Yu Min Hwang** Jin Young Kim** 요약,.,,, 10..,,. Abstract In this paper, evaluation indices of the location selection of satellite ground station is proposed to maximize satellite applications. The evaluation index has been developed based on radio-wave environmental conditions to avoid the radio interference to perform the missions of ocean observation satellite. The radio interference investigation was generated based on professionals of satellite control/ operation, calibration/validation, applications. And evaluation index was applied to a candidate site of ground station. In the future, this result may be able to compare with the results of other candidate sites for the best location selection of 'marine mission-oriented ground stations'. According to recent trends of mission-oriented ground stations, the results can be used for location selection of 'marine mission-oriented ground station' as reference. Key words: Ground Station, Radio-Wave Interference, Marine Mission-Oriented Ground Stations, Satellite Communication. 서론, (microwave). (Department of Electronics and Electrical Engineering, Dankook University) * (Ocean Satellite Center, Korea Ocean Research Development Institute) ** (Department of Electronics Convergence Engineering, Kwangwoon University) Manuscript received April 28, 2014 ; Revised August 4, 2014 ; Accepted August 28, (ID No Corresponding Author: Jin-Young Kim( jinyoung@kw.ac.kr) 944 c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved.

2 .,,, [1] [5]. (,,, ),.,,,,,.,, [6] [11].,, 10.. 전파환경조사 /. L-Band S-Band, NOAA L-Band, MODIS-Aqua, MODIS-Terra, NPP X-Band., A.,.,. 2-1 측정개요 A GHz(L-Band), GHz(S-Band), GHz(X-Band)., ,. 2-2 측정방법 (45 8, HL-040) - ( , AC008, DA180) 표 1. Table 1. Equipments and specifications for electronic interference measurement. Log-Peridoc ANT Microwave Directional ANT (feeder) L (feeder) S Rohde & Schwarz, ESU-26 : 20 Hz 26.5 GHz Rohde & Schwarz, HL-040 : 400 MHz 3.6 GHz Rohde & Schwarz, AC008 : 1 18 GHz Agilent, E4440A : 3 Hz 26.5 GHz GigaSat, DA-180 : GHz 1.8M GHz, GHz, 945

3 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 25, no. 9, Sep (, 1, AC008) A (0, 45, 90, 135, 180, 225, 270, 315 ), 2, S , AC008. L S (0, 90, 180, 270 ), NOAA 2. DA- 180, 2, Peak MAX Hold db μvm/m, dbm. 2-3 간섭허용레벨.,. (C/I: Carrier to Interference), C/I (S/N: Signal to Noise) C/I. (1-a), (1-b) a 2, Open plan building 2.2, Semi open building 3.3, Closed office 4.5. = S/N(C/N)+Fade Margin+α, (1-a) = C/I+Fade Margin+α. (1-b) 2-4 신호대간섭비계산,. C/ 10Log( / ), (2) (μw), (μw). =, (3) (Received Carrier Level) C, I,.,,,,,,. =, (4),,,,. (3), (4),,,.. 측정결과 1, 2, LP ANT(HL- 040) (0, 45, 90, 135, 180, 225, 270, 315 ). 3 S-Band(2 2.5 GHz), M/W., 2,

4 천리안 위성을 위한 위성 지상국 후보지 전파 환경 측정 및 간섭 연구 안테나 지향각에 따른 주변 전파 감시 도 도 도 도 그림 1. L-Band (0, 45, 90, 135 ) Fig. 1. Monitoring of radio waves according to L-Band antenna angle of beam spread(0, 45, 90, 135 ). 안테나 지향각에 따른 주변 전파 감시 도 도 도 도 그림 2. L-Band (180, 225, 270, 315 ) Fig. 2. Monitoring of radio waves according to L-Band antenna angle of beam spread(180, 225, 270, 315 ). 947

5 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 25, no. 9, Sep 천리안 위성 수신 주파수 감시 주변 주파수 감시 그림 3. S-Band (2 2.5 GHz) Fig. 3. Frequency monitoring nearby S-Band(2 2.5 GHz). 그림 5. (L-Band) Fig. 5. Monitoring of frequency received by Chollian satellite(l-band). 천리안 위성 수신 대역 내 이상 신호 그림 6. (M1) Fig. 6. Abnormal signals in Chollian satellite Band(M1). 주변 주파수 감시 그림 4. X-Band ( GHz) Fig. 4. Frequency monitoring nearby X-Band( GHz). 대역은 이동통신, 2,300 2,400 MHz 대역은 휴대인터넷(WiBro)용 주파수 대역, 2, MHz 대 역에서 도서통신용 M/W 주파수로 사용되고 있음을 알 수 있었다. 그림 4에서 MODIS(Aqua&Terra), NPP 등 X-밴드 극궤 도 위성 수신 주파수의 주변 환경 측정은 국간 중계용 (M/W) 신호가 간헐적으로 출현하였다. 그림 5에서 천리안 해양 관측 위성(L-Band) 수신 환경은 방송중계용 주파수 및 1,695.4 MHz(5M20G1D) 점유대역 폭 내에 이상신호가 출현하였다. 1,700 1,710 MHz는 FM 방송 중계용(M/W) 주파수 대역이 사용되었으며, 1,698 MHz 신호가 dbm 세기로 약 1시간 정도 간격으 2,170 MHz 948 로 간헐적으로 출현하였다. 그림 6에서는 1,695.9 MHz 신호가 dbm으로 수 신되어 평상시 정상 신호와 구분되지 않으나, 앙각의 변 화를 주는 경우에는 구분되었다. 그림 7에서는 극궤도 위성인 NOAA의 위성신호 Lband에서 FM 방송 중계용 주파수 외에 특이신호는 출현 하지 않았다. 1,700 1,710 MHz는 FM 방송 중계용(M/W) 주파수 대역으로 1,702.7 MHz 신호가 dbm 세기 로 강하게 유입되었으며, 비정지 위성으로 추정되는 신호 가 극히 짧게 포착되었다. Ⅳ. 적합성 평가 결과 및 검토 본 내용은 위성 지상국 위치 선정에서 전체 총점 1,000 점 중 전파간섭(주파수)에 대한 총점 240점으로 설문참여 자의 대부분이 가장 중요하다고 선택한 전파 간섭이 174 점을 받았다. 표 2의 배정된 점수를 분석한 결과, 전문가

6 ,.. 결론 그림 7. NOAA ( GHz) Fig. 7. NOAA satellite frequency monitoring results( GHz). 표 2. <A> (350 ) Table 2. Suitable test results for proposed site <A> C D C B C A B B B B 표 3. Table 3. Obtained score formula for each indicator. (W) A( ) 5 B() 4 C() 3 D() 2 E( ) 1 (S t :, S i : ),.,., 2010 (, ).,.,,. <A>,., <A> ( ) ,,. 949

7 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 25, no. 9, Sep References [1], " ",, 37(12), p. 90, [2],,, [3],,,,,,, " (GOCI) ",, 26(2), p. 263, [4], " ",,, [5],,,, " ",, 14(2), pp. 9-13, [6],,, " (GOCI) ", 2012, 1(1), p. 90, [7],,,, [8],,, " (GOCI) ",, 26(2), pp , [9],,, " (FRIC) ",, 43(2), pp , [10],,, "COMS ", 2006, 1(1), pp , [11], (1-1273),,, : ( ) : ( ) : NJIT () : MBA : MIC : KT() : : [ 주관심분야 ],, RFID/IP- USN, : ( ) : ( ) : [ 주관심분야 ],, R&D 950

8 천리안 위성을 위한 위성 지상국 후보지 전파 환경 측정 및 간섭 연구 황유 민 년 월 광운대학교 전파공학과 (공학 사 년 월 현재: 광운대학교 전파공학 과 석박사통합과정 [주 관심분야] 가시광통신, LBS, 재난통 신, 5G 이동통신 : ) 김진 영 년 2월: 서울대학교 전자공학과 (공학 박사) 2001년 2월: SK텔레콤 네트웍연구소 책임 연구원 2001년 3월 현재: 광운대학교 전자융합 공학과 교수 [주 관심분야] 디지털통신, 가시광통신, UWB, 부호화, 인지무선통신, 5G 이동통신 등

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