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Playback 데이터 전송방법에 의한 위성 수신 특성 평가에 관한 연구
이용주(Yoong-Ju Lee) 산업기술교육훈련학회 2008 산업기술연구논문지 (JITR) Vol.13 No.1
The transmission technique for 1.5Mbps playback data is proposed in satellite motion environment. is represented in this paper. The available frequencies of subcarriers and modulation indexes by the proposed method show subcarrier frequencies of 16kHz, 262.144kHz for telecommand and telemetry, and 1.0, 0.8rad for telecommand and telemetry, respectively. The modulation indexes for range measurement signal are 1.0 and 0.4rad for major tone and minor tone signal, respectively. The transmission method for 1.5Mbps playback data is the PCM/BPSK/PM method, and shows 2.2rad and 1.5MHz for modulation index and subcarrier frequency, respectively. The proposed transmission techniques of KOMPSAT TTC signal represent enough gain margins of 23.43 to 36.75dB, and range accuracy characteristics within 3meters.
16kHz GSTDN 방식 위성거리측정방법을 이용한 TTC RF Loop Back 회로시스템의 전파지연 측정 연구
이용주(Yoong-Ju Lee) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.4
Propagation delay of TTC RF loop back system is measured by using 16 kHz ground space tracking and data network(GSTDN) satellite range measurement method in this study. Amount of propagation delay generated from earth station equipments has to be measured accurately, because the amount has to be compensated for range data. The propagation delay of TTC RF loop back system was 282 ns and its equivalent distance was 84.5 m. These values are almost equal to the measured delay of 272 ns and the equivalent distance of 81.6 m. Therefore the accuracy of distance measurement was demonstrated, and it can be utilized for earth station correction coefficients of measured distance to satellite.
밀결합선로를 이용한 대역통과필터의 성능 향상에 관한 연구
이용주(Yoong-Ju Lee) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.4
The improvement of characteristics for a broadband differential bandpass filter using broadside coupled lines will be studied. By using a simplified formula, group delay results of a vertically symmetric and a vertically asymmetric single-stage tight coupled line bandpass filters are analyzed in the passband. Also, a hybrid multi-stage structure, embedded in a multi-layer substrate, is consisted of vertically-symmetric and asymmetric stages. Finally, the effect of the number of stages on the amount of group delay variation is discussed.