• 제목/요약/키워드: Aerial vehicle

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실시간 상황 인식을 위한 센서 운용 모드 기반 항공 영상 요약 기법 (Aerial Video Summarization Approach based on Sensor Operation Mode for Real-time Context Recognition)

  • 이준표
    • 한국컴퓨터정보학회논문지
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    • 제20권6호
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    • pp.87-97
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    • 2015
  • 항공 영상 요약은 무인항공기를 통해 획득된 전체 영상의 내용을 제한된 시간 내에 효과적으로 브라우징 함으로써 감시 정찰 지역에 대한 상황 인식을 가능하게 하는 기술이다. 항공 영상의 정확한 요약을 수행하기 위해 본 논문에서는 센서 운용 모드를 집중감시, 전역감시 그리고 구역감시모드로 구분하고 해당 센서 운용 모드의 특성을 고려하여 항공 영상 요약을 수행한다. 특히 집중감시 모드에서의 영상 요약은 화면 내 움직임이 있는 관심 객체의 지속적인 추적을 기반으로 수행되며 이를 위해 본 논문에서는 지역 움직임 벡터(partitioning motion vector)와 해당 벡터가 발생한 영역에서의 시공간적 중요도 지도(spatiotemporal saliency map)를 활용한 움직임 반응 추적 기법을 제안한다. 제안하는 알고리즘의 효율성과 적합성을 확인하기 위해 실 항공 영상을 대상으로 실험을 수행하였다. 도출된 실험 결과를 통해 제안하는 방법은 전체 항공 영상에서의 영상 요약을 위해 센서 운용 모드에 따라 정확한 대표 프레임을 검출하였으며 이에 따라 대용량의 무인항공기 획득 영상이 효과적으로 요약될 수 있음을 확인하였다.

무인항공사진측량 소프트웨어를 이용한 3차원 공간정보 생성 및 비교 (Generation and Comparison of 3-Dimensional Geospatial Information using Unmanned Aerial Vehicle Photogrammetry Software)

  • 양승룡;이학술
    • 한국재난정보학회 논문집
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    • 제15권3호
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    • pp.427-439
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    • 2019
  • 연구목적: 다양한 목적으로 생성되는 무인비행체 기반의 공간정보를 서로 다른 SW로 생성하고, 정사영상 및 DSM의 위치정확도 분석과 3D mesh의 텍스처 매핑을 비교 분석하고자 하였다. 연구방법: 서로 다른 두 개의 SW를 이용하여 동일한 무인항공영상 데이터를 처리하고, 공간정보를 생성하였다. 생성된 공간정보 중 정사영상과 DSM은 수평위치 및 수직위치 오차의 RMSE를 계산함으로써 정량적 분석을 수행하고, 정성적 분석을 수행함으로써 무인항공사진측량 SW의 공간정보 생성 결과를 비교분석하고자 하였다. 연구결과: 각각의 SW로 생성된 정사영상 및 DSM의 위치정확도에서는 큰 차이가 없었으며, 3D mesh의 텍스쳐 매핑에서 차이를 보였다. 3D mesh의 생성에는 무인항공사진측량 SW가 영향을 미치는 것을 알 수 있었다. 결론: 무인비행체 기반의 공간분석을 위한 정사영상, DSM의 생성에는 SW에 따른 영향이 없는 것으로 나타났으나 3D 가시화를 목적으로 할 경우에는 SW에 따라 텍스처 매핑 결과가 다르게 나타나는 것을 알 수 있었다.

3차원 환경 기반 무인 항공기 생존성 극대화를 위한 이동 경로 계획 (A Path Planning to Maximize Survivability for Unmanned Aerial Vehicle based on 3-dimensional Environment)

  • 김기태;전건욱
    • 산업공학
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    • 제24권4호
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    • pp.304-313
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    • 2011
  • An Unmanned Aerial Vehicle(UAV) is a powered pilotless aircraft, which is controlled remotely or autonomously. UAVs are currently employed in many military missions(surveillance, reconnaissance, communication relay, targeting, strike etc.) and a number of civilian applications(communication service, broadcast service, traffic control support, monitoring, measurement etc.). For accomplishing the UAV's missions, guarantee of survivability should be preceded. The main objective of this study is the path planning to maximize survivability for UAV based on 3-dimensional environment. A mathematical programming model is suggested by using MRPP(Most Reliable Path Problem) and solved by transforming MRPP into SPP(Shortest Path Problem). This study also suggests a $A^*PS$ algorithm based on 3-dimensional environment to UAV's path planning. According to comparison result of the suggested algorithm and SPP algorithms (Dijkstra, $A^*$ algorithm), the suggested algorithm gives better solution than SPP algorithms.

MRF 기법을 이용한 초소형 비행체 프로펠러 공력특성 연구 (THE STUDY ON THE PROPELLER AERODYNAMIC CHARACTERISTIC OF MICRO AERIAL VEHICLE USING THE MRF METHOD.)

  • 최원;김지홍;이경태;박찬우
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2010년 춘계학술대회논문집
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    • pp.32-36
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    • 2010
  • This paper dealt with the flow simulation for the optimum designed propeller for Micro Aerial Vehicle, using a commercial CFD program(FLUENT). The propeller was modeled by the Multiple Reference Frame(MRF) method. For the validation of the computational method, the flow field analysis results for the propeller were compared with the flow analysis results, which are using Xfoil, for the optimum design, and with the wind tunnel data of a similar propeller model. By these validation processes, the reliability of MRF method was confirmed.

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Ironbird Ground Test for Tilt Rotor Unmanned Aerial Vehicle

  • Hwang, Soo-Jung;Choi, Seong-Wook
    • International Journal of Aeronautical and Space Sciences
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    • 제11권4호
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    • pp.313-318
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    • 2010
  • The power plant system of a tilt rotor unmanned aerial vehicle (UAV) was verified by the Ironbird ground test, which considerably reduces cost and risk during the developmental stages. The function and performance of the engine, drive line, nacelle conversion, and rotor systems were evaluated using a building block test approach. The Ironbird test concept facilitates the discovery of potential faults in earlier stages of the testing period. As a result, the developmental testing period could effectively be shortened. The measured test data acquired through a ground control and data acquisition system exhibited satisfactory results which meet the developmental specifications of a tilt rotor UAV.

무인항공기 자동이착륙을 위한 레이다 비콘 시스템의 추적필터 설계 (A Tracking Filter Design of the Radar Beacon System for Automatic Take-off and Landing of Unmanned Aerial Vehicle)

  • 김만조;황치정
    • 한국항공운항학회지
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    • 제21권1호
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    • pp.23-29
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    • 2013
  • This paper presents a tracking filter of radar beacon system (RBS) for automatic takeoff and landing of an unmanned aerial vehicle. The proposed tracking filter is designed as the decoupled tracking filter to reduce the computational burden. Also, an adaptive estimation method of the measurement error covariance is proposed to provide an improved tracking performance compared to the conventional decoupled tracking filter whenever the accuracy of RBS observations is degraded. 100 times Monte Carlo runs performed to analyze the performance of the proposed tracking filter in case of normal operation and degraded operations, respectively. The simulation results show that the proposed tracking filter provides the improved tracking accuracy in comparison with the conventional decoupled tracking filter.

틸트로터 무인기의 충돌회피기동 모사 (Collision Avoidance Maneuver Simulation of Tilt Rotor Unmanned Aerial Vehicle)

  • 황수정;이명규;오수훈
    • 한국항공운항학회지
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    • 제15권3호
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    • pp.33-45
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    • 2007
  • The collision avoidance maneuver flight simulation for tilt rotor unmanned aerial vehicle was performed by time-accurate numerical integration method based on wind tunnel test data. Five representative collision avoidance maneuvers were simulated under constraints of aerodynamic stall, propulsion power, structural load, and control actuator capability. The collision avoidance performances of the maneuvers were compared by the computed collision avoidance times. The sensitivities of initial flight speed and collision zone shape on the collision avoidance time were investigated. From these results, it was found that the moderate pull-up turn maneuver defined using moderate pitch and maximum roll controls within simulation constraints is the most robust and efficient collision avoidance maneuver under the various flight speeds and collision object shapes in the tilt rotor UAV applications.

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리눅스 기반 무인항공기 제어 애플리케이션 개발 (Development of Flight Control Application for Unmanned Aerial Vehicle Employing Linux OS)

  • 김명현;문승빈;홍성경
    • 제어로봇시스템학회논문지
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    • 제12궈1호
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    • pp.78-84
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    • 2006
  • This paper describes UAV (Unmanned Aerial Vehicle) control system which employs PC104 modules. It is controlled by application program based on Linux OS. This application consists of both Linux device driver in kernel-space and user application in user-space. In order to get data required in the unmanned flight, external devices are connected to PC104 modules. We explain how Linux device drivers deal with data transmitted by external devices and we account for how the user application controls UAV on the basis of data processed in the device driver as well. Furthermore we look into the role of GCS (Ground Control Station) which is to monitor the state of UAV.

무인 항공기 생존성 극대화를 위한 이동 경로 계획 알고리즘 선정 (A Selection of Path Planning Algorithm to Maximize Survivability for Unmanned Aerial Vehicle)

  • 김기태;전건욱
    • 대한안전경영과학회지
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    • 제13권2호
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    • pp.103-113
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    • 2011
  • This research is to select a path planning algorithm to maximize survivability for Unmanned Aerial Vehicle(UAV). An UAV is a powered pilotless aircraft, which is controlled remotely or autonomously. UAVs are currently employed in many military missions(surveillance, reconnaissance, communication relay, targeting, strike etc.) and a number of civilian applications(communication service, broadcast service, traffic control support, monitoring, measurement etc.). In this research, a mathematical programming model is suggested by using MRPP(Most Reliable Path Problem) and verified by using ILOG CPLEX. A path planning algorithm for UAV is selected by comparing of SPP(Shortest Path Problem) algorithms which transfer MRPP into SPP.

전기동력 소형무인항공기의 성능분석 (Performance Analysis of an Electric Powered Small Unmanned Aerial Vehicle)

  • 이창호;김성욱;김동민
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2010년도 제34회 춘계학술대회논문집
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    • pp.226-230
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    • 2010
  • 본 논문에서는 배터리와 전기모터 방식의 추진장치를 사용하는 소형무인항공기의 비행성능을 분석한다. 비행시험을 통해 얻은 데이터로부터 공력특성을 예측하고, 이를 활용하여 비행성능을 예측한다. 최대 항속시간을 얻을 수 있는 적정 비행속도를 제시하고, 비행속도에 따른 항속시간 및 항속거리를 예측한다.

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