• Title/Summary/Keyword: Formation Flying

Search Result 92, Processing Time 0.033 seconds

Positional Stability Analysis of Trailing Aircraft in Formation Flight (편대비행에서 후방 항공기의 위치 안전성 분석)

  • Cho, Hwan Kee
    • Journal of the Korean Society for Aviation and Aeronautics
    • /
    • v.24 no.2
    • /
    • pp.19-24
    • /
    • 2016

  • Positional stability analysis based on aerodynamic forces and induced moments of formation flight using two small aircraft models is presented. The aerodynamic force and moments of the trailing aircraft are analyzed in the aspect of flight stability. The induced moments with the change of local flow direction by wing-tip vortex from the leading aircraft can affect the flight positional stability of aircraft in closed formation flight. Aerodynamic forces and moments of trailing aircraft model are measured by 6-component internal balance at the 49 locations with vertical and lateral space between two aircraft models. Results are shown that the positional stability of trailing aircraft in formation flight can be analyzed by positional stability derivatives with vertical and lateral space. It is concluded that flying positions can be important factors for aircraft position stability due to induced aerodynamic force and moments with vertical and lateral spacing by the variation of flow pattern from the leading aircraft in formation flight.

  • https://doi.org/10.12985/ksaa.2016.24.2.019 인용 PDF KSCI

A Study for Drone to Keep a Formation and Prevent Collisions in Case of Formation Flying (드론의 삼각 편대비행에서 포메이션 유지 및 충돌 방지 제어를 위한 연구)

  • Cho, Eun-sol;Lee, Kang-whan
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • 2016.05a
    • /
    • pp.499-501
    • /
    • 2016

  • In this paper, we suggest an advance method for maintaining a perceived behavior as triangle formation and preventing collision between each other in case of a flying drone. In the existing studies, the collision of the drone is only controlled by using light entered in the camera or the image processing. However, when there is no light, it is difficult to confirm the position of each other and they can collide because this system can not confirm the each other's position. Therefore, in this paper, we propose the system to solve the problems by using the distance and the relative coordinates of the three drones that were determined using the ALPS(Ad hoc network Localized Positioning System) algorithm. This system can be a new algorithm that will prevent collisions between each other during flying the drone object. The proposed algorithm is that we make drones maintaining a determined constant value of the distance between coordinates of each drone and the measured center of the drone of triangle formation. Therefore, if the form of fixed formation is disturbed, they reset the position of the drone so as to keep the distance between each drone and the center coordinates constant. As a result of the simulation, if we use the system where the supposed algorithm is applied, we can expect that it is possible to prevent malfunction or an accident due to collisions by preventing collisions of drones in advanced behavior system.

  • PDF

Laser-based Relative Navigation Using GPS Measurements for Spacecraft Formation Flying

  • Lee, Kwangwon;Oh, Hyungjik;Park, Han-Earl;Park, Sang-Young;Park, Chandeok
    • Journal of Astronomy and Space Sciences
    • /
    • v.32 no.4
    • /
    • pp.387-393
    • /
    • 2015

  • This study presents a precise relative navigation algorithm using both laser and Global Positioning System (GPS) measurements in real time. The measurement model of the navigation algorithm between two spacecraft is comprised of relative distances measured by laser instruments and single differences of GPS pseudo-range measurements in spherical coordinates. Based on the measurement model, the Extended Kalman Filter (EKF) is applied to smooth the pseudo-range measurements and to obtain the relative navigation solution. While the navigation algorithm using only laser measurements might become inaccurate because of the limited accuracy of spacecraft attitude estimation when the distance between spacecraft is rather large, the proposed approach is able to provide an accurate solution even in such cases by employing the smoothed GPS pseudo-range measurements. Numerical simulations demonstrate that the errors of the proposed algorithm are reduced by more than about 12% compared to those of an algorithm using only laser measurements, as the accuracy of angular measurements is greater than $0.001^{\circ}$ at relative distances greater than 30 km.

  • https://doi.org/10.5140/JASS.2015.32.4.387 인용 PDF KSCI KPUBS HTML