研究生: |
林彥程 Lin, Yen-Cheng |
---|---|
論文名稱: |
以無人機動態搜尋細懸浮微粒排放源方法 Dynamic Searching Approach for the Fine Particulate Matter (PM 2.5) Pollutant Source using Drone |
指導教授: |
賀耀華
Ho, Yao-Hua |
學位類別: |
碩士 Master |
系所名稱: |
資訊工程學系 Department of Computer Science and Information Engineering |
論文出版年: | 2019 |
畢業學年度: | 107 |
語文別: | 中文 |
論文頁數: | 51 |
中文關鍵詞: | 感測器網路 、細懸浮微粒 、煙流追蹤 |
英文關鍵詞: | Sensor network, PM2.5, Plume tracing |
DOI URL: | http://doi.org/10.6345/THE.NTNU.DCSIE.008.2019.B02 |
論文種類: | 學術論文 |
相關次數: | 點閱:186 下載:9 |
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空氣汙染對人體健康造成危害,其細懸浮微粒會堆積在心肺,長期下來造成更高的死亡風險,然而管制空汙的成效受限於稽查、取締的效率,人員的蒐證在時間與空間上皆有所限制,因此,本研究提出了一套以無人機自動搜尋空汙排放源的方法,透過感測器網路的輔助資訊,結合無人機搜尋演算法來一步步接近排放源,並精準的將其定位出來。為了達到蒐證目的,必須能在空汙事件發生時即進行搜索,並在無人機續航力內完成搜尋,定位結果需要足夠的精準度以確定目標。我們使用LASS感測網路觀察即時的PM2.5資訊,在空汙目標區域取得背景濃度與過去一小時最高濃度作為指標,無人機依據指標來調整每一步的飛行距離,以在靠近排放源時增加搜尋密度,完成搜尋時,使用最高濃度的量測地點作為排放源定位結果。我們提出的飛行演算法一共有三種:(一)貪婪飛行法以鋸齒狀的飛行軌跡左右偵測並轉向濃度高的一側;(二)動態飛行法在行進前執行濃度取樣,判斷行進的方向,並依據濃度調整每一步的距離;(三)混和飛行法結合前兩者的優勢,透過門檻值調整兩者的切換時機。研究的實驗結果顯示,無人機能在20分鐘續航力內,完成距離誤差2公尺內的定位精準度。
Living in an environment filled with air pollution will affect our body health, cause chronic illness, and increase the fatality rate. However, it is difficult to regulated air pollution effectively, due to the need to accurately gathering evidence to prove any illegal emission. In this research, we propose a method to exploit the ability of a drone to locate air pollution (i.e., particulate matter) emission source quickly. Utilizing the information provided by an existing sensor network, the drone is able to make correct decisions when searching for pollution sources. In the proposed system, Location Aware Sensing System (LASS) provides the continuous monitoring information of PM 2.5 (Particulate Metter 2.5) to initialization searching plan by limiting a searching area. In the beginning, our drone utilizes the PM2.5 concentration information provided by LASS to adjust its searching direction and distance to an intermediate point. After an intermediate location point is reached, our drone will stop and sense the current PM2.5 concentration. Next, the drone continues to adjust the searching path with its searching direction and distance when the concentration level increased, respectively. The three searching path strategies are proposed - Greedy, Dynamic, and Hybrid Approach. The searching process repeats itself until ten of the continuous sensed PM2.5 concentration levels dropped below a threshold or the power of drone fell lower than the maximum flight time (with the reserved power for the return home distance). Once the searching process is finished, the location of the air pollution emission source is estimated by the highest contraction level measured by drone. The three of proposed strategies are compared with Random Way-Point and Space-Filling Curve. Experiment results show our proposed techniques are able to achieve estimation error below 2 meters within 20 minutes.
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