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3D Unmanned Aerial Vehicle Path Planning Based on Voronoi Diagram
Chen, Chien Hsu
Unmanned Aerial Vehicles(UAVs)
Ant Colony Optimization
Shuttle Radar Topography Mission (SRTM)
Digital Elevation Models (DEM)
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|摘要:||無人飛行載具(Unmanned Aerial Vehicles, UAVs)已廣泛運用於民生及軍事用途，為提高任務執行之效能及安全性，有關自主性飛行控制之路徑規劃，已是各國重要發展關鍵技術，然而無人飛行載具飛行航路需滿足諸多飛行限制，以利任務遂行。現階段較為熟悉之最佳化演算法計有：基因演算法、粒子演算法及類神經網路等，本文則以模擬螞蟻覓食行為之群蟻最佳化演算法(Ant Colony Optimization, ACO)作為基礎，並建置地形模型、威脅源模型及考量載具飛行性能，評估航程距離、威脅程度及飛行高低累計代價，規劃三維飛行路徑，以供決策者參考。
經由群蟻演算最佳化路徑產生後，本文再對於生成航跡進行區域最佳解分析，調整最佳路徑，增加飛行航路效益。為驗證本文所提方法之可用性，最後章節以美國太空梭雷達地形任務(Shuttle Radar Topography Mission, SRTM)數值地型高程資料(Digital Terrain Elevation Models, DTEM)模擬飛行路徑，藉由通過MATLAB對其程式模擬，說明本論文研究方法之可行性。|
Unmanned Aerial Vehicles have been widely operated in civil and military domain. Intelligent path planning of autonomous flight control has been considered to be a pivotal technology for flight path planning, so as to promote mission effectiveness and safety. However, there are still essential constraints, which UAV path planning issues are supposed to comply with. For the time being, there are well-known algorithms such as Genetic Algorithm, Particle Swarm Optimization, and Neutral Network, which are prevailing. The method proposed in this thesis is based on the Ant Colony Optimization (ACO); in addition, it utilizes the digital terrain model, the threat model, and the aerodynamics performance constraints and tries to minimize the cost of the flight path. Finally, the results obtained are intended to present to a commander for decision making. Ant Colony Optimization model consists of probability distribution, positive feedback, and greedy algorithm. On account of accumulation of path pheromone, which are stemmed from threat intensity, terrain elevation, and path distance, near optimal path may be found. To reduce the huge computation time, the Voronoi Diagram is applied to produce flight path firstly, and the cost of the path is preprocessed by considering the threat positions and intensity which were known in advance; moreover, UAV performance constraints have to be taken into account. That is, the digital terrain elevation and the slope have to be adjusted for the avoidance of aircraft crash. Finally, the proposed method tries to carry out a local optimization method to improve the flight path by trajectory adjustment. To verify the feasibility of the proposed method, NASA SRTM (Shuttle Radar Topography Mission) DEM (Digital Elevation Models) was adopted for the flight path finding. The results reveal to effectiveness of the proposed method.
|Appears in Collections:||資訊科學與工程學系所|
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