• Title/Summary/Keyword: 궤도모델

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Development of the GOCI Radiometric Calibration S/W (정지궤도 해양위성(GOCI) 복사보정 S/W 개발)

  • Cho, Seong-Ick;Ahn, Yu-Hwan;Han, Hee-Jeong;Ryu, Joo-Hyung
    • Proceedings of the KSRS Conference
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    • 2009.03a
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    • pp.167-171
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    • 2009

  • 정지궤도에서는 세계 최초의 해양관측위성으로 개발된 정지궤도 해양위성(GOCI, Geostationary Ocean Color Imager)은 통신해양기상위성(COMS, Communication, Ocean and Meterological Satellite)의 탑재체로서 2009년말 발사 예정이다. 정지궤도 해양위성의 복사보정은 센서의 전기적 특성에 의한 잡음을 제거하기 위한 암흑전류 교정(Dark Current Correction)을 먼저 수행한 다음, 주운영지상국인 해양위성센터(KOSC, Korea Ocean Satellite Center)에서 수신된 위성의 원시자료의 Digital Number(DN)를 실제 해양원격탐사에서 이용하는 물리량인 복사휘도(Radiance, $W/m^2/{\mu}m/sr$)로 변환하는 복사보정을 수행한다. 정확도 높은 복사보정을 수행하기 위해서는 기준광원의 복사휘도와 센서의 물리적 특성을 정확하게 알아야 한다. 정지궤도 해양위성 궤도상 복사보정(on-orbit radiometric calibration)에서는 태양이 기준광원이기 때문에, 기준 태양복사모델(Thuillier 2004 Solar Irradiance Model)에서 지구-태양간 거리 변화(1년 주기)를 보정한 태양의 방사도 (Irradiance)를 이용하고, 태양입사각에 대한 태양광 확산기의 감쇄 특성 변화를 고려하여 센서에 입력되는 복사휘도를 계산한다. 센서의 물리적 특성으로 인한 복사보정의 오차를 줄이기 위해 우주방사선 및 우주먼지(space debris)로 인해 위성 운용기간 중 그 특성이 저하되는 태양광 확산기(solar Diffuser)의 특성변화를 모니터링하기 위한 DAMD(Diffuser Aging Monitoring Device)를 이용한다. 정지궤도 해양위성 주관운영기관인 한국해양연구원의 해양위성센터에서는 정지궤도 해양위성 복사보정을 수행하기 위한 S/W를 통신해양기상위성 자료처리시스템 개발사업의 일환으로 개발하였으며, 관련 성능 시험을 수행하고 있다.

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Determination of Upper Limit of Rail Pad Stiffness for Ballasted and Concrete Track of High-Speed Railway Considering Running Safety (주행 안전을 고려한 고속철도 자갈궤도 및 콘크리트궤도 레일패드의 강성 상한 결정)

  • Yang, Sin-Chu;Jang, Seung-Yup;Kim, Eun
    • Journal of the Korean Society for Railway
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    • v.14 no.6
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    • pp.526-534
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    • 2011

  • In this study, proposed is the methodology to determine the upper limit for stiffness of rail pad for the ballasted and concrete track in high-speed railway in the viewpoint of running safety, considering the dynamic characteristics of train and track and the operation environment. For the track irregularity, one of the most important input parameters for traintrack interaction analysis, the reference vertical track irregularity PSDs(power spectral densities) for the ballasted and concrete track in a wide range of frequencies were proposed based on those presented in France and Germany and that obtained from the measured data at Kyeong-Bu 1st phase high-speed railway line. Using these reference PSD models, the input data for the vertical track irregularity data were regenerated by random generation process, and then, the wheel load reduction rates according to the stiffness of the rail pads have been calculated by the train-track interaction analysis technique. Finally, by comparing the wheel load reduction rates calculated with the derailment criteria prescribed in the Korean standards for railway vehicle safety criteria, the upper limits for the stiffness of rail pad have been proposed.

  • https://doi.org/10.7782/JKSR.2011.14.6.526 인용 PDF KSCI

Performance Analysis of GPS and QZSS Orbit Determination using Pseudo Ranges and Precise Dynamic Model (의사거리 관측값과 정밀동역학모델을 이용한 GPS와 QZSS 궤도결정 성능 분석)

  • Beomsoo Kim;Jeongrae Kim;Sungchun Bu;Chulsoo Lee
    • Journal of Advanced Navigation Technology
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    • v.26 no.6
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    • pp.404-411
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    • 2022

  • The main function in operating the satellite navigation system is to accurately determine the orbit of the navigation satellite and transmit it as a navigation message. In this study, we developed software to determine the orbit of a navigation satellite by combining an extended Kalman filter and an accurate dynamic model. Global positioning system (GPS) and quasi-zenith satellite system (QZSS) orbit determination was performed using international gnss system (IGS) ground station observations and user range error (URE), a key performance indicator of the navigation system, was calculated by comparison with IGS precise ephemeris. When estimating the clock error mounted on the navigation satellite, the radial orbital error and the clock error have a high inverse correlation, which cancel each other out, and the standard deviations of the URE of GPS and QZSS are small namely 1.99 m and 3.47 m, respectively. Instead of estimating the clock error of the navigation satellite, the orbit was determined by replacing the clock error of the navigation message with a modeled value, and the regional correlation with URE and the effect of the ground station arrangement were analyzed.

  • https://doi.org/10.12673/jant.2022.26.6.404 인용 PDF KSCI HTML