基于信號檢測方法的三維空間WSN覆蓋問題研究
[Abstract]:The basic task of wireless sensor networks is to detect specific events and information. Therefore, monitoring performance and coverage problems have become a hot issue in the design and application of wireless sensor networks. At present, there are a lot of theoretical results in this field, but the results of these theories still have the following shortcomings: (1) most of them are Boolean models. And the environmental noise and signal attenuation are ignored in the establishment of the model. (2) most of the research is based on the ideal two-dimensional plane, and the spatial correlation between the signals received by multiple sensors is ignored. However, the actual application of wireless sensor networks has been expanded to three dimensional space, which is obviously not in accordance with the actual situation. In view of the practical application characteristics and requirements of wireless sensor networks in information perception and event detection, this paper considers the effects of data characteristics, environmental factors and node distribution of measured signals. This paper focuses on the sensor node perception model and network coverage. Considering the spatial correlation between the data received by wireless sensor nodes in noisy environment, a sensing unit model for joint detection of two points in three dimensional space is established. On this basis, a more efficient three dimensional space coverage method based on two theories is proposed by combining the algorithm of constructing space coverage model based on polyhedron. On the basis of the coverage method, the results are analyzed and verified by software simulation, and the efficiency of the method is compared with that of the traditional method. Compared with the traditional spatial detection coverage problem, this paper has the following innovations: 1. The disadvantages of the traditional perception model are summarized, and the probabilistic model, which takes environmental noise and signal attenuation into account, is adopted. 2. The spatial correlation of received signals between nodes and nodes is considered. 3. 3. A unit perception model in three dimensional space is established. 4. After getting the unit awareness model, this paper introduces how to use points to achieve efficient coverage. By using the detection method and the layout scheme studied in this paper, the number of sensor nodes can be saved in practical application, and the effect of using sensor nodes efficiently can be achieved, which has certain practical guiding value.
【學位授予單位】:電子科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TN929.5;TP212.9
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