• Title, Summary, Keyword: 비행경로

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Autonomous Formation Flight Tests of Multiple UAVs (다수 무인항공기의 자동 편대비행 시험)

  • Song, Yong-Kyu;Heo, Chang-Hwan;Lee, Sang-Jun;Kim, Jung-Han
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.38 no.3
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    • pp.264-273
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    • 2010
  • In this work, autonomous formation flight tests of multiple UAVs are experimentally studied. After a guidance and control system for a UAV is designed and tested, PID formation controller for follower UAV is tested using longitudinal and lateral distance feedback. It is shown that more stable and efficient formation guidance system is obtained by using position and attitude of the leader aircraft, which is exploited to calculate virtual waypoint for follower. In order to improve transient response during turn, part of roll command of the leader is added to the guidance command. Finally, autonomous formation flight test results of 3 UAVs are shown by using the best guidance algorithm suggested.

Structural Equation Modeling about Family Relationship, Self-Efficacy, Self-Esteem, and Delinquency of Adolescent in Single-Parent Families (한부모가정 청소년의 가족관계, 자기효능감 및 자아존중감과 비행의 구조모형 검증)

  • Lee, Si-Yeon
    • The Journal of the Korea Contents Association
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    • v.14 no.11
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    • pp.759-771
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    • 2014
  • This study examines the overall structure among family relationship, self-efficacy, self-esteem, and delinquency of adolescent in single-parent families using structural equation modeling to provide theoretical basis preventable juvenile delinquency. The data of 516 middle and high school students in the research into the promotion policies on children and adolescents' mental health(2012) by the National Youth Policy Institute analysed. The result of this study are: (1) family relationship affects self-efficacy, self-esteem, and delinquency of adolescent, (2) family relationship affects delinquency of adolescent by the mediation of self-esteem, (3) self-efficacy doesn't affect delinquency of adolescent. This study suggests the necessity of both intervention as well as the development implementation of practical methods for the prevention of delinquency of adolescent.

Trajectory Generation, Guidance, and Navigation for Terrain Following of Unmanned Combat Aerial Vehicles (무인전투기 근접 지형추종을 위한 궤적생성 및 유도 항법)

  • Oh, Gyeong-Taek;Seo, Joong-Bo;Kim, Hyoung-Seok;Kim, Youdan;Kim, Byungsoo
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.40 no.11
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    • pp.979-987
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    • 2012
  • This paper implements and integrates algorithms for terrain following of UCAVs (Unmanned Combat Aerial Vehicles): trajectory generation, guidance, and navigation. Terrain following is very important for UCAVs because they perform very dangerous missions such as Suppression of Enemy Air Defences while the terrain following can improve the survivability of UCAVs against from the air defence systems of the enemy. To deal with the GPS jamming, terrain referenced navigation based on nonlinear filter is chosen. For the trajectory generation, Voronoi diagram is adopted to generate horizontal plane path to avoid the air defense system. Cubic spline method is used to generate vertical plane path to prevent collisions with ground while flying sufficiently close to surface. Follow-the-Carrot and pure pursuit tracking methods, which are look-ahead point based guidance algorithms, are applied for the guidance. Numerical simulation is performed to verify the performance of the integrated terrain following algorithm.

Three Dimensional Flight Simulator of Terrain Using Satellite Image and Elevation Data (지형자료와 위성영상을 이용한 3차원 비행 시뮬레이터 개발)

  • Choi, K.H.;Jung, I.S.;Cho, S.I.;Yang, Y.K.;Lee, J.H.
    • Journal of The Korea Computer Graphics Society
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    • v.1 no.2
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    • pp.269-272
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    • 1995
  • 본 논문에서는 자연지형의 3차원 투사도 제작기술에 비행기의 비행조건을 고려하여 개발한 비행 시뮬레이터에 대하여 설명하고자 한다. 여기서 발표하고자 하는 비행 시뮬레이터란 3차원의 자연지형을 마치 비행기를 타고가며 보는 것과 같은 효과를 낼 수 있게 하는 시스템을 말한다. 본 시스템은 사용자의 편의성을 도모하기 위하여 Sun workstation (SPARC 10)상에서 X11R5와 Motif 그리고 C언어를 이용하여 개발되었으며, 사용자가 비행경로, 비행속도, 비행고도 등의 비행 파라메타들을 마우스를 이용하여 손쉽게 입력할 수 있도록 구성되어 있다.

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Integrated Flight Simulation Program for Multicopter Drones by Using Acausal and Object-Oriented Language Modelica (비인과, 객체지향적 언어 모델리카를 이용한 멀티콥터형 드론의 통합 비행 시뮬레이션 프로그램)

  • Jin, Jaehyun
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.45 no.5
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    • pp.437-446
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    • 2017
  • An integrated flight simulation program for multicopter drones is presented. The program includes rigid body dynamics, propeller thrust, battery energy, control, and air. Using this program, users can monitor and analyze the states of drones along flight trajectories. As a programming language, Modelica has been chosen, that specializes in simulation program development. Modelica enables users to develop simulation programs efficiently due to acausal and object oriented properties. For missions including horizontal and vertical maneuvers, many dynamical states of drones have been analyzed with simulation results.

A Study about an Autonomic Flight of Unmanned Aerial Vehicle(UAV) Using the GPS (GPS를 활용한 무인 비행체의 자율비행에 관한 연구)

  • Oh, Sung-Nam;Lee, Gum-Soo;Son, Young-Ik;Kim, Kab-Il
    • Proceedings of the KIEE Conference
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    • pp.357-358
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    • 2008
  • 본 논문은 GPS를 이용한 무인 비행체의 자율비행에 관한 연구를 다루었다. 비행체의 종류는 크게 고정익기와 회전익기로 나뉘는데 본 연구에서는 회전익기의 형태를 가진 Quarter Vehicle을 사용하였다. Quarter Vehicle은 4개의 프로펠러에 의한 양력과 회전 반발력으로 비행을 한다. 이때의 양력은 수평면에 대해 수직으로 추력을 발생시키므로 다른 비행체보다 불안정하며 이를 안정하게 제어하기 위해 관성 센서를 적용하여 균형을 유지한다. 본 연구에서는 UAV의 자세와 균형을 안정적으로 유지하기 위해 관성센서를 적용하였으며 GPS를 활용하여 독립적인 자율비행이 가능하도록 하였다. 정확한 위치정보를 제공하는 GPS는 3개 이상의 위성으로부터 시간 및 위치 정보를 받아 좌표를 계산하고 비행체의 위치, 속도 및 방향을 결정하여 자율 비행이 가능하도록 한다. 또한 초형 지자기센서를 비행체에 적용하여 GPS의 방향 정보를 보완하도록 하였다. 본 논문에서는 무인 비행체의 자율비행의 기초가 되는 위치좌표 계산을 위한 GPS의 적용 방법과 비행경로계획 알고리즘을 제시 한다.

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Unmanned aerial vehicle routing algorithm using vehicular communication systems (차량 통신 시스템 기반 UAV 라우팅 알고리즘)

  • Kim, Ryul;Joo, Yang-Ick
    • Journal of the Korean Society of Marine Engineering
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    • v.40 no.7
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    • pp.622-628
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    • 2016
  • The prosperity of IT technologies and the removal of restrictions regarding Unmanned Aerial Vehicles (UAVs), also known as drones, have driven growth in their popularity. However, without a proper solution to the problem of accident avoidance for UAVs, this popularity increases the potential for collisions between UAVs and between UAV and terrain features. These collisions can occur because UAVs to date have flown using radio control or image recognition based autonomous navigation. Therefore, we propose efficient UAV routing schemes to tackle the collision problem using vehicular communication systems. Performance evaluation by computer simulation shows that the proposed methods effectively reduce the collision probability and improve the routing efficiency of the UAV. Furthermore, the proposed algorithms are compatible and can be directly applied with small overhead to the commercial vehicular communication system implementation.

Autopilot Design and Flight Test of an Unmanned Airship for Aviation Photograph (항공촬영용 비행선의 자동비행장치 개발 및 비행시험)

  • 홍천한;김병수;박주원;제정형;이성근
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.34 no.7
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    • pp.45-54
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    • 2006
  • General unmaned airship, in use of aviation photography, needs both airship -controller and camera-controller who work together in harmony. In oder to reduce this manpower and get the good Geographical Information Systems(GIS) data, it is necessary to use a autopilot controller which guides a exact path lines. This paper presents the autopilot control law base on classical PID control. Moreover, this paper shows the result of flight test, the procedure of gain tuning and LOS guidance algorism that is reduce a tracking error.

A generation of Optimal Path Passing through Shadow Volume in Terrain (지형에서의 음영공간을 통과하는 최적경로 생성)

  • Im, In-Sun;Koo, Ja-Young
    • Journal of the Korea Society of Computer and Information
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    • v.12 no.6
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    • pp.131-137
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    • 2007
  • I intend to seek the shortest path which an aircraft safely flies to its destination through the shadow volume of three dimensional terrain which propagation does not extend. Herein, I propose a method in which a relatively wide shadow volume is divided with a polygon type of block polygon, a path up to the intermediate destination is sought in the divided block polygons according to the weight, and then, the shortest path up to the final destination is sought by repeating courses for seeking a destination again from the adjacent polygon based on the starting point of the intermediate destination within the divided polygon. The shortest path was searched by using the revised algorithms which apply to a critical angle from graph growth algorithms on the shadow volume which propagation on the actual three dimensional terrain does not extend to. The experiment shows that a method proposed in this paper creates effective flying curves.

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Aviation Weather Service by using the Spatial Information System (공간정보 시스템을 이용한 항공 기상정보 서비스)

  • Park, Jin-Hyo;Lee, Sang-Hoon
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.541-544
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    • 2005
  • 최근 들어 개인용 경항공기 및 헬리콥터 등의 저고도 항공기들의 사용이 급증하고 있다. 항공기 운항의 증가와 더불어 항공기 사고 또한 증가하고 있는데, 비행을 준비하는 단계에서 경로상의 기상정보와 지형정보를 정확하게 인지할 수 있다면 보다 안전한 비행경로의 결정과, 유사시 좀 더 빠르고 적절한 판단을 내리는데 기여할 수 있을 것이다. 따라서 본 논문에서는 기상데이터를 공간데이터로 모델링 하여 공간정보시스템에 구현함으로써 지형과 기상정보를 가시적인 방법으로 보다 효율적으로 전달할 수 있는 방안을 제안한다.

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