• Aerospace Engineering and Technology
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• v.3 no.2
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• pp.133-140
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• 2004

In some cases, the launch vehicle is fatally affected by the change of weather condition. Thus the real time monitoring of weather condition is indispensible for successful launch campaign. This paper described general characteristics of weather radar for space center. The analysis of weather radar requirements has been carried out focusing on the transmitting power, gain of antenna, half power beam width, and minimum detectable signal.

• Aerospace Engineering and Technology
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• v.2 no.1
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• pp.182-189
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• 2003

Communication Ocean Meteorological Satellite(COMS) for the hybrid mission of meteorological observation, ocean monitoring, and telecommunication service is planned to be launched onto Geostationary Earth orbit (GEO) in 2008 according to the korea national space program, For the development of the meteorological payload of COMS, imager, the characteristics of Modulation Transfer Function (MTF) for GEO meteorological imager is investigated and the theoretical MTF limit is analyzed for each spectral channel of the imager in the both cases of a currently operating GEO instrument technology and an advanced GEO instrument technology under development. This study shows that MTF value can be considerably low in the infrared channels with longer wavelength than 10㎛ due to diffraction effect so that the MTF performance of long wavelength infrared channels should be paid attention to for the development of the imager.

• Aerospace Industry
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• s.106
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• pp.36-38
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• 2010

2010 벤쿠버 올림픽에서 보여준 세계 5위권 우리 선수들의 선전은 국민들에게 벅찬 감동을 심어 주었을 뿐만 아니라 대한민국의 국가 브랜드가치를 높이는 데 커다란 기여를 하였다. 특히 우리가 예상치 못했던 분야인 스피드 스케이팅에서의 금메달 획득은 어떤 분야에서건 목표를 향해 도전하는 자에게 꿈이 현실로 열렬 수 있다는 희망을 상징적으로 보여 주었다. 곧 발사를 앞두고 있는 통신해양기상위성(이하 통해기)의 발사성공은 또 다른 분야인 항공우주분야에서 우리나라 위성개발 역사에서 처음으로 시도되는 정지궤도 위성의 개발성공과 이를 이용한 다양한 분야에서의 활용 시대를 여는 의미 있는 이벤트가 될 것이다 통해기 발사에 즈음하여 현재까지의 위성준비현황을 중심으로 그 동안의 개발과정과 그 개발이 가지는 의미를 되짚어 본다.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.29 no.4
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• pp.1-20
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• 2021

Due to the recent rapid increase in passenger and cargo air transport demand, the capacity of Jeju International Airport has been approaching its limit. Even though in COVID-19 crisis which has started from Nov 2019, Jeju International Airport still suffers from strong demand in terms of air passenger and cargo transportation. However, it is an undeniable fact that the delay has also increased in Jeju International Airport. In this study, we analyze the correlation between weather and delayed departure operation based on both datum collected from the historical airline operation information and aviation weather statistics of Jeju International Airport. Adopting machine learning techniques, we then analyze weather condition Jeju International Airport and construct a delay prediction model. The model presented in this study is expected to play a useful role to predict aircraft departure delay and contribute to enhance aircraft operation efficiency and punctuality in the Jeju International Airport.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.31 no.3
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• pp.50-58
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• 2023

Sudden wind changes at low altitudes pose a significant threat to aircraft operations. In particular, airports located in regions with complex terrain are susceptible to frequent abrupt wind variations, affecting aircraft takeoff and landing. To mitigate these risks, Low Level Wind shear Alert System (LLWAS) have been implemented at airports. This study focuses on understanding the characteristics of wind shear and developing a prediction model for Jeju International Airport, which experiences frequent wind shear due to the influence of Halla Mountain and its surrounding terrain. Using two years of LLWAS data, the study examines the occurrence patterns of wind shear at Jeju International Airport. Additionally, high-resolution numerical model is utilized to produce forecasted information on wind shear. Furthermore, a comparison is made between the predicted wind shear and LLWAS observation data to assess the prediction performance. The results demonstrate that the prediction model shows high accuracy in predicting wind shear caused by southerly winds.

• Aerospace Industry
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• s.88
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• pp.50-51
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• 2005

국내 첫 초음속기 T-50 양산 1호기 출고/국산 전술통제기 1호기 KO-1출고/대한항공,대파된 미 공군 HH-60G 탐색구조헬기조기 수리 납품 달성/대한항공, B717 기수동체 최종호기 납품/국산 스텔스 무인전투기 개발/토종 기상위성 첫 수출/국내 첫 우주발사체 추적소 제주에 건설

• Aerospace Engineering and Technology
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• v.3 no.1
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• pp.267-271
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• 2004

The satellite in the geostationary orbit rotates around Earth center with the same angular rate as the Earth. So, the Earth can be observed with sequential time series. GOES(Geostationary Operational Environmental Satellites)-9 is a meteorological satellite, which is now located at 155ㆁE geostationary orbit location in order to monitor East-Asia meteorological environment including Korean Peninsular. Every meteorological information is acquired from GOES-9 with the period of about 1 hour. COMS(Communication, Ocean and Meteorological Satellite) has been developed by KARI(Korea Aerospace Research Institute) since 2003 and will be launched at 2008. COMS will be located at different orbit location compared to GOES-9. In this study, a simulated COMS image which is the perspective from different geostationary orbit location is generated using an GOES-9 image.

• Electronics and Telecommunications Trends
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• v.36 no.4
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• pp.48-60
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• 2021

Following the global air-traffic market growth outlook, urgency of technical development is needed in responding to changes in the international air-traffic management paradigm and to prepare technology securing and spreading strategies, which are consistent with systematic aviation weather service policies and evolution direction. Although air traffic has decreased significantly due to COVID-19, normalcy is expected from 2024, as announced by IATA. According to the future air transportation market outlook and development trends of related technologies, Korea has established and implementing the next-generation air transportation system construction plan(NARAE) to secure international competitiveness and leadership in the future. Therefore, this paper describes the technical, economic background and requirements of numerical model-based aviation weather R&D projects for successful implementation of domestic NARAE plans and providing aviation safety and air traffic service efficiency. Furthermore, we proposed numerical-model-based technology development content, strategies and detailed load-map.

• Aerospace Engineering and Technology
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• v.6 no.2
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• pp.87-95
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• 2007

The ocean and meteorological payloads of COMS are concerned to experience degration of image quality due to the disturbance induced by the motion of moving parts of the payloads. And thruster firings for stationkeeping and wheel offloading are expected to degrade the image quality of the optical payloads. In case of COMS, in order to keep the optical payload free from the mechanical interference from the other payload, the operation design approach has been taken. This paper introduces the operation design of COMS taken to avoid these problems. In order to meet users requirement by avoiding the degradation of image quality, the timeline of optical payloads and housekeeping are optimized, and operational constraints are applied to the mirror motion of the meteorological payload. This paper also introduces the results of time budget analysis performed to validate the operation design.

• Aerospace Engineering and Technology
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• v.6 no.2
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• pp.66-72
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• 2007

In this study, we would like to report the analysis of COMS(Communication, Ocean & Meterological Satellite) MI2U(Meteo-Imager Interface Unit) ORB (On Board Reconfiguration) verification test. MI2U is one of equipment integrated on COMS and in charge of TM/TC function and Power Supply function of MI(Meteo-Imager). COMS, an geo-stationary satellite, is a multi-functional satellite accommodation two observation payloads and one communication payload.