• Title, Summary, Keyword: 비행경로

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Determination of Waypoints to Maximize the Survivability of UAV against Anti-air Threats (대공위협에 대한 무인기 생존성 최대화 경로점 결정기법)

  • Park, Sanghyuk;Hong, Ju-Hyeon;Ha, Hyun-Jong;Ryoo, Chang-Kyung;Shin, Wonyoung
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.42 no.2
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    • pp.127-133
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    • 2014
  • This paper proposes a determination method of waypoints to maximize the survivability of a UAV. Voronoi diagram which is used for the initial selection of waypoint candidates is the most widely used path planning technique to avoid the threat as far as possible when the location and strength of the threat are given. But if threat strength is different each other and flight path is constrained along with straight lines, Voronoi diagram has limitations in real applications. In this study, the initial waypoints obtained from Voronoi diagram are optimized considering the shape of each threat. Here, a waypoint is optimized while adjacent waypoints are fixed. By repeating this localized optimization until whole waypoints are converged, computation time for finding the best waypoints is greatly reduced.

Definition of Impact Angle and Impact Angle Control Law Against Maneuvering Target (기동표적에 대한 입사각 정의와 입사각 제어 유도법칙)

  • Kim, Hyun-Seung;Park, Sang-Sup;Ryoo, Chang-Kyung
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.43 no.8
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    • pp.669-676
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    • 2015
  • In this paper, a guidance law for intercepting maneuvering target with a desired impact angle is proposed. The proposed guidance law is modified from the optimal impact angle control law for a fixed target and given by a biased PN law with the impact angle control term in addition to the conventional PN law. Three different kinds of desired impact angles in the respect of LOS angle, flight path angle, and relative flight path angle to the target are defined. The performance of the proposed guidance law is investigated via numerical simulations for various air-to-air engagement scenarios.

A Study on the Low Elevation Target Tracking under Multipath Conditions Using Laser Tracking System (레이저 추적기를 이용한 저고도 비행체 추적 기법 연구)

  • Yoo, Seung-Oh
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.26 no.6
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    • pp.572-580
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    • 2015
  • RF skin tracking of instrumentation RADAR cannot acquire stable track data, because of effect of multipath interference especially elevation direction. In this paper, low altitude target tracking method using laser tracking system is suggested to overcome this restriction. The effect of multipath can be reduced by increasing angle resolution with laser characteristics of very short pulse and narrow beamwidth. RF skin track, beacon track and laser track data for the integrated calibration target on the ground and target ship on the sea are gathered. And they are compared and analyzed to confirm the performance of laser tracking system. As a result, it shows that the suggested laser track method has better performance than RF skin track under multipath conditions.

Design of Flight Learning System Using Sketch-based Interface (스케치 인터페이스를 이용한 항공기동 학습 시스템 개발)

  • Kim, Sang-Jin;Park, Tae-Jin;Choy, Yoon-Chul
    • Journal of Korea Multimedia Society
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    • v.13 no.5
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    • pp.771-779
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    • 2010
  • Sketch-based interface is used more and more in developing animation contents. Particularly, there has been a system where the user's sketch inputs are interpreted and presented as live motions. In this study¸ it is to design an animated flight learning system using sketch-based interface. Most of the flights include movements in three-dimensional space and have unique and complex flight patterns. In other words, the actual flight movements not only include acceleration and deceleration, rising and falling, straight or circular flying, but also may include combinations of two or more movements as they simultaneously occur such as accelerating while falling, or slowing down while rising, and so forth. And, currently existing flight learning animation system cannot present such complex flight patterns to the pilots of aircrafts or to those personnel for air-traffic controllers. Hence, it is to be shown in this study that unit-path sketch animation method can support quicker ways to create animations to present those complex flight movements, and requires lesser inputs compared to the existing frame-based animation method. Also, the flight learning system suggested uses the flight-route realization tasks to reflect complex flight patterns, and therefore creates animations close to real as possible.

A study on the moderation effects of parents and adolescent's communication in the causal relationships between adolescent's stress and juvenile's delinquents (청소년의 생활 스트레스와 청소년 비행의 인과경로에 있어서 부모-자녀 간 의사소통의 조절효과에 관한 연구)

  • Lim, Guem-Ok;Kang, Kil-Hyun;Park, Hwie-Seo
    • Journal of the Korea Society of Computer and Information
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    • v.20 no.1
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    • pp.247-254
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    • 2015
  • This study is to explore the effects of adolescent's stress on juvenile delinquents and the moderating effects of communication between adolescent and the parents. For this study, we sampled and surveyed middle school students. The analytical results are the followings. Juvenile's stress has a significant effects on juvenile's delinquents and the level of communication between juveniles and the parents is an important factor concerned with juvenile's delinquents. This study suggested some policy implications based on this results.

Correlations between the Positioning Accuracy of Waypoint Flight of the Micro-UAV (소형UAV의 프로펠러 개수와 웨이포인트 비행위치 정확성과의 상관관계)

  • Kim, jae-ung
    • Proceedings of the Korea Contents Association Conference
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    • pp.197-198
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    • 2016
  • 본 연구에서는 소형UAV중 쿼드콥터, 헥사콥터, 옥토콥터를 이용하여 문화재지정구역 현장에서 경로비행을 실제 운용함으로써 명승조사연구에 적용 가능한 소형UAV를 확인하고자 하였다.

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Design and Flight Test of Autonomous Landing Approach Algorithm for UAV (무인 항공기의 자동 착륙 접근 알고리즘 설계 및 비행시험)

  • Jeong, Minjeong;Ryu, Han-Seok;Park, Sanghyuk
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.41 no.6
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    • pp.458-464
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    • 2013
  • This paper presents an algorithm for autonomous landing approach of a unmanned aerial vehicle. The main purpose of the autonomous landing approach in this study is to help a safe landing at night. From any initial position of the aircraft when this function is engaged, a flight path command is generated from the initial position. The shortest combination of an initial circular arc, a straight line segment, and a final circular arc is chosen for the flight path that will lead the aircraft to one end of runway for a landing. The algorithm is initially validated through numerous simulations with various initial conditions of aircraft. Then it is successfully validated through a number of flight tests.

3-Dimensional Path Planning and Guidance for High Altitude Long Endurance UAV Including a Solar Power Model (태양광 전력모델을 포함한 장기체공 무인기의 3차원 경로계획 및 유도)

  • Oh, Su-hun;Kim, Kap-dong;Park, Jun-hyun
    • The Journal of Advanced Navigation Technology
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    • v.20 no.5
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    • pp.401-407
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    • 2016
  • This paper introduces 3-dimensional path planning and guidance including power model for high altitude long endurance (HALE) UAV using solar energy. Dubins curve used in this paper has advantage of being directly available to apply path planning. However, most of the path planning problems using Dubins curve are defined in a two-dimensional plan. So, we used 3-dimensional Dubins path generation algorithm which was studied by Randal W. Beard. The aircraft model which used in this paper does not have an aileron. So we designed lateral controller by using a rudder. And then, we were conducted path tracking simulations by using a nonlinear path tracking algorithm. We generate examples according to altitude conditions. From the path tracking simulation results, we confirm that the path tracking is well on the flight path. Finally, we were modeling the power system of HALE UAVs and conducting path tracking simulation during 48hours. Modeling the amount of power generated by the solar cell through the calculation of the solar energy yield. And, we show the 48hours path tracking simulation results.

IT Convergence UAV Swarm Control for Aerial Advertising (공중 광고를 위한 IT 융합 무인항공기 군집 제어)

  • Jung, Sunghun
    • Journal of the Korea Convergence Society
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    • v.8 no.4
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    • pp.183-188
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    • 2017
  • As the price of small UAVs is getting cheaper and its controllability is getting greatly increased, many aerial applications using both fixed-wing and hoverable UAVs have appeared in recent years. In this paper, a new aerial advertising method is proposed using four hoverable UAVs. Using the UAV swarm control method, four UAVs are maneuvered to carry a $7.07{\times}7.07m^2$ square banner along collision-free and predefined waypoints for aerial advertising. According to simulation results, it takes about 270 s for UAVs to perform aerial advertising in $669{\times}669m^2$ size area and the minimum distance among UAVs turns out to be 0.45 m which proves there is no any collision. Due to abrupt direction changes of UAVs along the predefined waypoints, UAVs cannot always maintain exact square formation and it results the maximum and minimum side lengths of square formation to be 10.35 m and 1.96 m, respectively. Also, the maximum and minimum diagonal lengths of square formation turn out to be 14.75 m and 2.78 m, respectively.