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Stratospheric Platform Deployment Strategy for Avoiding Satellite Signal Blockage
Hase, Yoshihiro,Shibata, Nobuyuki 통신위성우주산업연구회 2000 Joint Conference on Satellite Communications Vol.2000 No.-
A stratospheric platform is a very large unmanned airship which will be an ideal base station for any kind of wireless system. But there will be a disadvantage of blocking satellite broadcasting and communication links. We have calculated the receiving level degradation and shadowed area on the ground that is dependent on the position stability of the platform and on the configuration of satellite link and platform position. And we will show an eminent reduction of the shadowing effect by choosing and adjusting the nominal platform position. Also the number of houses that remain shadowed and its unavailability due to shadowing are also shown.
강자영 한국항행학회 2003 韓國航行學會論文誌 Vol.7 No.1
성층권에 통신중계기를 탑재한 비행선이나 비행기를 띄워서 무선중계시스템을 구축하고, 이 시스템을 광대역 무선 멀티미디어서비스 사업에 활용하는 방안이 추진되고 있다. 본 논문은 이러한 성층권 무선중계시스템을 구성하는 플랫폼의 운용개념을 정의하고, 성층권 관제시스템이 갖추어야 할 기능 및 구성요소를 설정하며, 향후 구축될 성층권 관제시스템의 설계를 구체화하기 위한 개념을 제공할 목적으로 수행된 연구의 결과이다. Recently, a new concept of telecommunication system, utilizing stratospheric platforms such as airships or airplanes, has been proposed. This system aims to provide broadband multimedia services, i.e. high-rate multimedia service, high-rate internet service, and leased line service. In this study, operation concept of the system is defined and by allocation required functions on the system and its subsystems, conceptual design of the ground control system for the stratospheric platforms is established and proposed.
Nonlinear Trajectory Tracking using Vectorial Backstepping Approach
Hyochoong Bang,Sangjong Lee,Haechang Lee 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper discussed a nonlinear trajectory tracking problem for stratospheric airship platform and a novel approach of the nonlinear control scheme is applied. Target airship model is the 200m stratospheric airship platform capable of flying upto 20 km altitude. Full 6-DOF nonlinear dynamics of unmanned airship are defined according to the target airship’ configuration including the moving windfield. Based on this airship model, a backstepping design formulation for the trajectory tracking control is described. The tracking control strategy of vectorial backstepping is applied to derive the tracking control law and global asymptotically stability is proved by Lyapunov stability analysis. Finally, numerical simulations have been carried out to assess the performance of the proposed tracking controller.