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THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2014 Sep.; 25(9), 944 951. http://dx.doi.org/10.5515/kjkiees.2014.25.9.944 ISSN 1226-3133 (Print) ISSN 2288-226X (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, 2014. (ID No. 20140428-039 Corresponding Author: Jin-Young Kim(e-mail: jinyoung@kw.ac.kr) 944 c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved.

.,,, [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 1.5 1.8 GHz(L-Band), 2 2.5 GHz(S-Band), 7.5 8.5 GHz(X-Band)., 5. 1. 22,. 2-2 측정방법. - 360 (45 8, HL-040) - ( 128.2 3, 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 : 1.45 21.2 GHz 1.8M 1.45 1.8 GHz, 2.17 2.655 GHz, 945

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 25, no. 9, Sep. 2014. - (, 1, AC008) A 360 45 8 (0, 45, 90, 135, 180, 225, 270, 315 ), 2, S 1 3 12, AC008. L S 360 90 4 (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., 2,110 946

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

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 25, no. 9, Sep. 2014. 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 (7.5 8.5 GHz) Fig. 4. Frequency monitoring nearby X-Band(7.5 8.5 GHz). 대역은 이동통신, 2,300 2,400 MHz 대역은 휴대인터넷(WiBro)용 주파수 대역, 2,400 2500 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 146.7 dbm 세기로 약 1시간 정도 간격으 2,170 MHz 948 로 간헐적으로 출현하였다. 그림 6에서는 1,695.9 MHz 신호가 146.6 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 105.3 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

,.. 결론 그림 7. NOAA (1.67 1.71 GHz) Fig. 7. NOAA satellite frequency monitoring results(1.67 1.71 GHz). 표 2. <A> (350 ) Table 2. Suitable test results for proposed site <A>. 1 2 3 4 5 6 7 8 9 10 240 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> ( ) 240 174.,,. 949

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 25, no. 9, Sep. 2014. References [1], " ",, 37(12), p. 90, 2010. [2],,, 2010. [3],,,,,,, " (GOCI) ",, 26(2), p. 263, 2010. [4], " ",,, 2005. [5],,,, " ",, 14(2), pp. 9-13, 1991. [6],,, " (GOCI) ", 2012, 1(1), p. 90, 2012. [7],,,, 2007. [8],,, " (GOCI) ",, 26(2), pp. 167-173, 2010. [9],,, " (FRIC) ",, 43(2), pp. 99-116, 2012. [10],,, "COMS ", 2006, 1(1), pp. 386-389, 2006. [11], (1-1273),,, 2012. 1981 2 : ( ) 1985 8 : ( ) 1993 1 : NJIT () 1991 7 : MBA 1981 31981 12 : MIC 1982 12006 1 : KT() 2006 32011 10 : 2007 22011 10 : 2011 11 [ 주관심분야 ],, RFID/IP- USN, 2007 3 : ( ) 2013 8 : ( ) 2007 7: [ 주관심분야 ],, R&D 950

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 2012 2 : ) 2012 3 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 1998 951