信號檢測理論在無線傳感器網(wǎng)絡(luò)目標(biāo)探測中的應(yīng)用研究
發(fā)布時間：2018-08-04 15:24
【摘要】：無線傳感器網(wǎng)絡(luò)(WSN,Wireless Sensor Networks)的提出,是基于環(huán)境監(jiān)測和目標(biāo)追蹤等一系列的實際應(yīng)用需求。作為一種新興的對環(huán)境和目標(biāo)進行感知與探測的技術(shù)手段,如何提高WSN對目標(biāo)的檢測效率是一個十分重要的研究內(nèi)容。因此,WSN的信號檢測問題是其應(yīng)用和研究的關(guān)鍵問題之一。本文利用信號檢測理論的經(jīng)典方法,以能量檢測器(ED,Energy Detector)和協(xié)方差檢測器(Covariance Detector)為主要研究目標(biāo),結(jié)合WSN的信號傳播模型以及空間相關(guān)性理論,采用本文定義的覆蓋面積作為性能指標(biāo),分析和比較了兩種檢測器的檢測性能。根據(jù)構(gòu)成檢測器的WSN節(jié)點個數(shù)分類,分別從單點獨立檢測、兩點聯(lián)合檢測和三點聯(lián)合檢測三種配置方式,對ED和CD的檢測性能進行了理論分析與仿真測試。在單點獨立檢測和兩點聯(lián)合檢測的研究中,理論分析與仿真測試結(jié)果相一致。對于ED,使用兩點聯(lián)合檢測可以獲得比單點獨立檢測更好的檢測性能(更大的覆蓋面積)。對于ED和CD進行兩點聯(lián)合檢測的性能研究中,ED采用AND和OR兩種判決規(guī)則。理論分析和仿真結(jié)果表明,當(dāng)節(jié)點間的距離較小時,使用CD可以獲得比ED更好的檢測效果。但是當(dāng)節(jié)點間的距離增大,使用ED的OR方式能獲得更好的檢測效果。對ED采用AND和OR兩種規(guī)則進行兩點聯(lián)合檢測所獲得的覆蓋面積進行分析可以得出結(jié)論,當(dāng)節(jié)點間的距離小于某一特定值,使用AND規(guī)則可以獲得比使用OR規(guī)則更好的檢測性能;反之,當(dāng)節(jié)點間的距離超過這一特定值,使用OR規(guī)則可以獲得比AND規(guī)則更好的檢測性能。對于采用ED進行兩點聯(lián)合檢測時AND規(guī)則與OR規(guī)則這一特定的性能分界點,本文從理論上進行了求解與驗證。論文還從理論上研究了三點聯(lián)合檢測問題,首先基于ED和CD這兩種基本檢測器,設(shè)計了適用于三點聯(lián)合檢測的檢測器。其次為了將三點聯(lián)合檢測的性能與單點獨立檢測以及兩點聯(lián)合檢測的性能進行比較,設(shè)計了一種對檢測器的目標(biāo)區(qū)域的檢測概率分布進行統(tǒng)計與表示的算法。最后通過這種方法,對檢測器的單點獨立檢測、兩點聯(lián)合檢測以及三點聯(lián)合檢測的性能進行分析,研究結(jié)果表明,使用三點聯(lián)合檢測的檢測器性能明顯下降。因此,使用兩點聯(lián)合檢測可以獲得最好的檢測效果。
[Abstract]:Wireless Sensor Network (WSNN) Wireless Sensor Networks) is based on a series of practical applications such as environmental monitoring and target tracking. As a new technique to perceive and detect the environment and target, how to improve the detection efficiency of WSN is a very important research content. Therefore, the signal detection problem of WSN is one of the key problems in its application and research. In this paper, the classical method of signal detection theory is used, the energy Detector and covariance detector (Covariance Detector) are the main research targets, and the signal propagation model of WSN and the spatial correlation theory are combined. The detection performance of the two detectors is analyzed and compared by using the coverage area defined in this paper as the performance index. According to the number of WSN nodes which constitute the detector, the detection performance of Ed and CD is analyzed theoretically and simulated from three configurations: single point independent detection, two point joint detection and three point joint detection. In the research of single point independent detection and two-point joint detection, the theoretical analysis is consistent with the simulation results. For EDs, using two-point joint detection can achieve better detection performance than single-point independent detection (larger coverage area). In the performance study of two points joint detection of Ed and CD, AND and OR are used in Ed. Theoretical analysis and simulation results show that CD can obtain better detection results than Ed when the distance between nodes is small. But when the distance between nodes increases, the OR method of Ed can obtain better detection effect. When the distance between nodes is less than a certain value, the detection performance of AND rule is better than that of OR rule. On the other hand, when the distance between nodes exceeds this specific value, the detection performance of OR rule is better than that of AND rule. In this paper, we solve and verify the AND rule and OR rule, which is a specific performance boundary point, when Ed is used for two points joint detection. The paper also studies the problem of three point joint detection theoretically. Firstly, based on Ed and CD two basic detectors, a detector suitable for three point joint detection is designed. Secondly, in order to compare the performance of three-point joint detection with that of single-point independent detection and two-point joint detection, a statistical and representation algorithm for the detection probability distribution of the target region of the detector is designed. Finally, the performance of single point independent detection, two point joint detection and three point joint detection is analyzed by this method. The results show that the performance of the detector using three point joint detection is obviously decreased. Therefore, the best detection effect can be obtained by using two-point joint detection.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5;TP212.9
本文編號：2164302
[Abstract]:Wireless Sensor Network (WSNN) Wireless Sensor Networks) is based on a series of practical applications such as environmental monitoring and target tracking. As a new technique to perceive and detect the environment and target, how to improve the detection efficiency of WSN is a very important research content. Therefore, the signal detection problem of WSN is one of the key problems in its application and research. In this paper, the classical method of signal detection theory is used, the energy Detector and covariance detector (Covariance Detector) are the main research targets, and the signal propagation model of WSN and the spatial correlation theory are combined. The detection performance of the two detectors is analyzed and compared by using the coverage area defined in this paper as the performance index. According to the number of WSN nodes which constitute the detector, the detection performance of Ed and CD is analyzed theoretically and simulated from three configurations: single point independent detection, two point joint detection and three point joint detection. In the research of single point independent detection and two-point joint detection, the theoretical analysis is consistent with the simulation results. For EDs, using two-point joint detection can achieve better detection performance than single-point independent detection (larger coverage area). In the performance study of two points joint detection of Ed and CD, AND and OR are used in Ed. Theoretical analysis and simulation results show that CD can obtain better detection results than Ed when the distance between nodes is small. But when the distance between nodes increases, the OR method of Ed can obtain better detection effect. When the distance between nodes is less than a certain value, the detection performance of AND rule is better than that of OR rule. On the other hand, when the distance between nodes exceeds this specific value, the detection performance of OR rule is better than that of AND rule. In this paper, we solve and verify the AND rule and OR rule, which is a specific performance boundary point, when Ed is used for two points joint detection. The paper also studies the problem of three point joint detection theoretically. Firstly, based on Ed and CD two basic detectors, a detector suitable for three point joint detection is designed. Secondly, in order to compare the performance of three-point joint detection with that of single-point independent detection and two-point joint detection, a statistical and representation algorithm for the detection probability distribution of the target region of the detector is designed. Finally, the performance of single point independent detection, two point joint detection and three point joint detection is analyzed by this method. The results show that the performance of the detector using three point joint detection is obviously decreased. Therefore, the best detection effect can be obtained by using two-point joint detection.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5;TP212.9
【參考文獻】
相關(guān)期刊論文 前2條
1 孫永進,孫雨耕,房朝輝;一種新的無線自組傳感器網(wǎng)絡(luò)組網(wǎng)算法[J];哈爾濱工業(yè)大學(xué)學(xué)報;2004年11期
2 馬祖長,孫怡寧,梅濤;無線傳感器網(wǎng)絡(luò)綜述[J];通信學(xué)報;2004年04期
，本文編號：2164302
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