• 제목/요약/키워드: Satellite Monitoring

검색결과 967건 처리시간 0.027초

Satellite-based Drought Forecasting: Research Trends, Challenges, and Future Directions

  • Son, Bokyung;Im, Jungho;Park, Sumin;Lee, Jaese
    • 대한원격탐사학회지
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    • 제37권4호
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    • pp.815-831
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    • 2021
  • Drought forecasting is crucial to minimize the damage to food security and water resources caused by drought. Satellite-based drought research has been conducted since 1980s, which includes drought monitoring, assessment, and prediction. Unlike numerous studies on drought monitoring and assessment for the past few decades, satellite-based drought forecasting has gained popularity in recent years. For successful drought forecasting, it is necessary to carefully identify the relationships between drought factors and drought conditions by drought type and lead time. This paper aims to provide an overview of recent research trends and challenges for satellite-based drought forecasts focusing on lead times. Based on the recent literature survey during the past decade, the satellite-based drought forecasting studies were divided into three groups by lead time (i.e., short-term, sub-seasonal, and seasonal) and reviewed with the characteristics of the predictors (i.e., drought factors) and predictands (i.e., drought indices). Then, three major challenges-difficulty in model generalization, model resolution and feature selection, and saturation of forecasting skill improvement-were discussed, which led to provide several future research directions of satellite-based drought forecasting.

위성항법 지상국 감시제어시스템 예비설계 (Preliminary Design of Monitoring and Control Subsystem for GNSS Ground Station)

  • 정성균;이재은;박한얼;이상욱;김재훈
    • Journal of Astronomy and Space Sciences
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    • 제25권2호
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    • pp.227-238
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    • 2008
  • 위성항법 지상국 기술은 위성으로부터 위성항법신호를 받아 위성항법신호를 감시하고 분석하며 위성에 보정정보를 업로드하는 기술로써 위성항법 인프라 구축에 매우 중요한 기술이며 여러 응용분야에 적용할 수 있는 핵심 기술이다. 이 중 한국전자통신연구원에서 개발하고 있는 감시제어시스템은 GPS 및 갈릴레오 항법 위성으로부터 신호 감시 데이터를 수집하여 위성항법 제어센터로 제공하는 기능을 수행하는 소프트웨어 시스템이다. 이 논문에서는 위성항법 지상국의 구성과 감시제어시스템의 목적 및 형상을 소개한 다음, 감시제어시스템의 적용 알고리즘을 소개하고 감시제어시스템의 예비설계를 기술하였다. 감시제어시스템은 데이터 수집, 데이터 포맷팅 및 저장, 데이터 오차 보정, 항법해 결정, 독립 품질 감시, 시스템 운용 및 유지 등의 모듈로 구성되어 있다. 감시제어시스템의 예비설계는 유스케이스 모델, 도메인 설계, 소프트웨어 구조설계, 사용자 인터페이스 구조 설계 과정을 통하여 이루어진다. 각 단계별 설계과정은 UML(Unified Modeling Language) 표준 방식에 따라 이루어졌다. 이 연구에서 설계된 감시제어시스템은 지상국의 운용 능력을 향상시킬 뿐만 아니라 상세설계의 기초자료로 이용될 것이다.

CONCEPTUAL DESIGN OF MONITORING AND CONTROL SUBSYSTEM FOR GNSS GROUND STATION

  • Jeong, Seong-Kyun;Kim, In-Jun;Lee, Jae-Eun;Lee, Sang-Uk;Kim, Jae-Hoon
    • Journal of Astronomy and Space Sciences
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    • 제24권4호
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    • pp.389-396
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    • 2007
  • The Global Navigation Satellite System (GNSS) becomes more important and is applied to various systems. Recently, the Galileo navigation system is being developed in Europe. Also, other countries like China, Japan and India are developing the global/regional navigation satellite system. As various global/regional navigation satellite systems are used, the navigation ground system gets more important for using the navigation system reasonably and efficiently. According to this trend, the technology of GNSS Ground Station (GGS) is developing in many fields. The one of purposes for this study is to develop the high precision receiver for GNSS sensor station and to provide ground infrastructure for better performance services on navigation system. In this study, we consider the configuration of GNSS Ground Station and analyze function of Monitoring and Control subsystem which is a part of GNSS Ground Station. We propose Monitoring and Control subsystem which contains the navigation software for GNSS Ground System to monitor and control equipments in GNSS Ground Station, to spread the applied field of navigation system, and to provide improved navigation information to user.

MULTISENSOR SATELLITE MONITORING OF OIL POLLUTION IN NORTHEASTERN COASTAL ZONE OF THE BLACK SEA

  • Shcherbak, Svetlana;Lavrova, Olga;Mytyagina, Marina;Bocharova, Tatiana;Krovotyntsev, Vladimir;Ostrovskiy, Alexander
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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    • pp.989-992
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    • 2006
  • The new approach to the problem of oil spill detection consisting in combined use of all available quasiconcurrent satellite information (AVHRR NOAA, TOPEX/Poseidon, Jason-1, MODIS Terra/Aqua, QuikSCAT) is suggested. We present the results of the application of the proposed approach to the operational monitoring of seawater condition and pollution in the coastal zone of northeastern Black Sea conducted in 2006. This monitoring is based on daily receiving, processing and analysis of data different in nature (microwave radar images, optical and infrared data), resolution and surface coverage. These data allow us to retrieve information on seawater pollution, sea surface and air-sea boundary layer conditions, seawater temperature and suspended matter distributions, chlorophyll a concentration, mesoscale water dynamics, near-surface wind and surface wave fields. The focus is on coastal seawater circulation mechanisms and their impact on the evolution of pollutants.

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Automated command generation for satellite control

  • Mo, Hee-Sook;Kim, Jae-Hoon;Lee, Ho-Jin
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1995년도 Proceedings of the Korea Automation Control Conference, 10th (KACC); Seoul, Korea; 23-25 Oct. 1995
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    • pp.380-383
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    • 1995
  • Since the generation and transmission of telecommand in satellite monitoring and control system depend on the decisions of operators, it is possible that operators with different levels of knowledge may generate different telecommands in the same situation. Because of this reason, automation technology of satellite operation is being researched and developed to minimize the decision error due to the operator's lack of experience. This paper suggests a method of automated satellite control, which generates telecommands automatically using the knowledge of satellite subsystem engineers or specialists for the ground system. This method provides safe satellite operation and expansion of satellite life time by automatic generation of the telecommands, so that the operator's interrupt is minimized which provides the efficient satellite control.

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The study of environmental monitoring by science airship and high accuracy digital multi-spectral camera

  • Choi, Chul-Uong;Kim, Young-Seop;Nam, Kwang-Woo
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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    • pp.750-750
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    • 2002
  • The Airship PKNU is a roughly 12 m (32 ft) long blimp, filled with helium, whose two-gasoline power(3hp per engine) are independently radio controlled. The motors and propellers can be tilted and are attached to the gondola through an axle and supporting braces. Four stabilizing fins are mounted at the tail of the airship. To fill in the helium, a valve is placed at the bottom of the hull. The inaugural flight was on jul. 31.2002 at the Pusan, S.korea Most environment monitoring system\ problem use satellite image. But, Low resolution satellite image (multi-spectral) : 1km ∼ 250 m ground resolutions is lows. So, detail information acquisition is hard at the complex terrain. High resolution satellite image (black and white) 30m : The ground resolution is high. But it is high price, visit cycle and delivery time is long So. We want make high accuracy airship photogrammetry system. This airship can catch picture Multi. spectral Aerial photographing (visible, Near infrared and thermal infrared), and High resolution (over 6million pixel). It can take atmosphere datum (Temperature (wet bulb, dew point, general), Pressure (static, dynamic), Humidity, wind speed). this airship is very Quickness that aircraft install time is lower than 30 minutes, it is compact and that conveyance is easy. High-capacity save image (628 cut per 1time (over 6million and 4band(R,G,B,NIR)) and this airship can save datum this High accuracy navigatin (position and rotate angle) by DGPS tech. and Gyro system. this airship will do monitor about red-tide, sea surface temperate, and CH-A, SS and etc.

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Delineation of Rice Productivity Projected via Integration of a Crop Model with Geostationary Satellite Imagery in North Korea

  • Ng, Chi Tim;Ko, Jonghan;Yeom, Jong-min;Jeong, Seungtaek;Jeong, Gwanyong;Choi, Myungin
    • 대한원격탐사학회지
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    • 제35권1호
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    • pp.57-81
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    • 2019
  • Satellite images can be integrated into a crop model to strengthen the advantages of each technique for crop monitoring and to compensate for weaknesses of each other, which can be systematically applied for monitoring inaccessible croplands. The objective of this study was to outline the productivity of paddy rice based on simulation of the yield of all paddy fields in North Korea, using a grid crop model combined with optical satellite imagery. The grid GRAMI-rice model was used to simulate paddy rice yields for inaccessible North Korea based on the bidirectional reflectance distribution function-adjusted vegetation indices (VIs) and the solar insolation. VIs and solar insolation for the model simulation were obtained from the Geostationary Ocean Color Imager (GOCI) and the Meteorological Imager (MI) sensors of the Communication Ocean and Meteorological Satellite (COMS). Reanalysis data of air temperature were achieved from the Korea Local Analysis and Prediction System (KLAPS). Study results showed that the yields of paddy rice were reproduced with a statistically significant range of accuracy. The regional characteristics of crops for all of the sites in North Korea were successfully defined into four clusters through a spatial analysis using the K-means clustering approach. The current study has demonstrated the potential effectiveness of characterization of crop productivity based on incorporation of a crop model with satellite images, which is a proven consistent technique for monitoring of crop productivity in inaccessible regions.

고해상도 위성영상과 인공지능을 활용한 국토 변화탐지 및 모니터링 연구: 실증대상 지역인 정읍시를 중심으로 (A Study on the Land Change Detection and Monitoring Using High-Resolution Satellite Images and Artificial Intelligence: A Case Study of Jeongeup City)

  • 조나혜;이정주;김현덕
    • 지적과 국토정보
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    • 제53권1호
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    • pp.107-121
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    • 2023
  • 실시간으로 변하는 국토를 광범위하게 취득하고, 이를 빠르고 정확하게 파악하기 위해 최근 공개 된 고해상도 국토위성 영상자료와 인공지능(AI; Artificial Intelligence)을 활용하고자 한다. 기존 위성 영상에 비해 국토위성의 경우 분광 및 주기 해상도가 높아져, 국토의 변화상을 주기적으로 모니터링하는 데 보다 적합한 자료원이 되었다. 따라서 본 연구는 국토위성을 취득하여 국토 변화를 탐지하기 위한 객체 8종을 선정하고, 이에 대한 데이터 셋 구축 및 AI 모델을 적용하여 분석하고자 한다. 다양한 유형의 객체 8종을 탐지하기 위한 최적의 모델과 변수 조건들을 확인하기 위해 여러 실험을 수행하고, AI 기반의 영상분석을 기술적으로 검토해보고자 한다.

대북 사회공헌형 산림탄소상쇄사업 모니터링 여건평가 (Evaluating Monitoring Condition for Forest Carbon Offset Project to Demonstrate CSR in North Korea)

  • 주승민;허만호;김종달;엄정섭
    • Spatial Information Research
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    • 제23권2호
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    • pp.11-20
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    • 2015
  • 모니터링은 북한지역을 대상으로 하는 사회공헌형 산림탄소상쇄 사업을 진행하는 과정에서 핵심요건으로 부각되고 있다. 온실가스 감축 여건에 대한 모니터링이 잘못되었을 경우, 입증수단과 방법을 사전에 점검하여 리스크와 불확실성을 최소화하여야 한다. 따라서 본 연구의 목적은 산림탄소상쇄사업에서 발생할 수 있는 입증책임에 관련된 쟁점들을 사전에 점검하고자 백두산을 대상으로 모니터링 여건(사업대상지의 적합성, 산림 바이오매스 성장에 따른 탄소축적, 바이오매스의 손실, 삼림 전용 및 훼손 여부, 환경, 사회, 경제적 영향에 의한 탄소 배출량)을 평가하였다. 인공위성 영상은 백두산의 산림현황을 가시적인 기록으로 제시하였는데, 대북 산림탄소상쇄사업에서 모니터링이 필요한 지표를 대부분 충족하는 것으로 확인되었다. 본 연구 결과는 북한에서 산림탄소상쇄 사업을 수행하려는 한국기업에게 중요한 참고자료로 활용될 수 있을 것으로 판단된다.

환경감시탑재체 개발 동향 (Development Trend of Environment Monitoring Payloads)

  • 연정흠;김성희;고대호;이승훈;용상순
    • 항공우주산업기술동향
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    • 제7권1호
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    • pp.79-88
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    • 2009
  • 세계적인 관심이 고조되고 있는 환경 및 기후변화는 사회 전분야에 걸쳐 폭넓게 영향을 미치고 있다. 최근들어, 환경감시의 필요성과 이에 대한 관심의 고조와 더불어 원격탐사기술의 발전으로 인공위성을 이용한 환경감시가 본격화되고 있다. 본 논문에서는 환경감시 탑재체의 개발동향을 살펴본다. 지금까지 개발되었거나 개발되고 있는 환경탑재체들의 주요 규격 및 관측방식, 관측대상 등을 사례별로 조사하여 소개하였다. 하나의 위성으로 전지구 관측을 위하여 저궤도 탑재체를 중심으로 개발이 이루어졌으나, 최근들어 시간해상도의 중요성이 강조되면서 정지궤도 탑재체의 개발도 이루어지고 있다. 또한 관측대상에 따라 자외선, 가시광선, 적외선 등의 탐측대역을 달리한 탑재체가 개발되고 있다. 향후 국내 환경탑재체의 개발은 이러한 추세를 고려하여 명확한 임무분석과 함께 추진되어져야 할 것이다.

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