本文關(guān)鍵詞： WiFi定位 室內(nèi)定位 特征匹配　出處：《北京交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：傳統(tǒng)的GPS等定位技術(shù)在室外已經(jīng)能夠?qū)崿F(xiàn)米級的精確定位,但在室內(nèi)環(huán)境下難以精確定位,隨著WiFi技術(shù)的普及以及WiFi熱點的覆蓋率在近兩年內(nèi)的不斷提升,人們對WiFi室內(nèi)定位技術(shù)的研究也越來越深入,定位算法層出不窮,WiFi室內(nèi)定位技術(shù)已經(jīng)逐漸由研究向商業(yè)化轉(zhuǎn)變�；赪iFi的各種應(yīng)用軟件開始如雨后春筍一般的出現(xiàn),基于WiFi的位置服務(wù)也呈現(xiàn)快速發(fā)展的趨勢。 本人完成的主要工作包括： (1)對基于WiFi位置特征匹配的室內(nèi)定位技術(shù)進行了深入研究,分析了各種因素對WiFi信號的影響,發(fā)現(xiàn)了傳統(tǒng)的基于WiFi位置特征匹配的室內(nèi)定位技術(shù)的不足,并結(jié)合項目實現(xiàn)提出了完善基于WiFi位置特征匹配的室內(nèi)定位算法提高定位精度的方法： 1)在特征庫建立階段加入過濾法,在數(shù)據(jù)采集完成后,通過統(tǒng)計每個采集點采集到的各個AP的次數(shù)來判斷對應(yīng)每個采集點的不夠穩(wěn)定的AP信號,然后將其排除,從而達到對數(shù)據(jù)進行過濾,排除特征庫的建立過程中引入的數(shù)據(jù)誤差,提高定位精度的目的。 2)在定位階段加入后矯正法,通過手機自帶的加速傳感器和計時器計算定位目標(biāo)從上一次正確定位到此次定位這段時間內(nèi)所經(jīng)過的位移,同時計算當(dāng)前定位結(jié)果與上一次正確定位的結(jié)果間的距離,如果兩個距離之差大于定位系統(tǒng)的定位誤差,則認(rèn)為此次定位結(jié)果錯誤,需重新進行定位以達到矯正的目的。 (2)設(shè)計與實現(xiàn)了一個基于Android系統(tǒng)的WiFi室內(nèi)定位系統(tǒng)。包括： 1)系統(tǒng)的需求分析； 2)前期數(shù)據(jù)的采集和分析； 3)系統(tǒng)特征庫的設(shè)計與實現(xiàn)； 4)定位功能的設(shè)計與實現(xiàn)。 本文設(shè)計與實現(xiàn)的系統(tǒng)能夠非常方便的應(yīng)用于一些大型的展覽館,商場,醫(yī)院等室內(nèi)環(huán)境下,為用戶提供精確的定位服務(wù),幫助用戶節(jié)約尋找的時間。
[Abstract]:Traditional positioning technology such as GPS has been able to achieve precise positioning in meter level outside, but it is difficult to locate accurately in indoor environment. With the popularization of WiFi technology and the increasing coverage of WiFi hot spots in recent two years, The research of WiFi indoor location technology has been more and more in-depth, and the localization algorithms have gradually changed from research to commercialization. All kinds of applications based on WiFi have begun to sprout. Location services based on WiFi also show a trend of rapid development. The main tasks I have completed include:. In this paper, the indoor location technology based on WiFi position feature matching is deeply studied, and the influence of various factors on WiFi signal is analyzed. The shortcomings of traditional indoor location technology based on WiFi position feature matching are found. Based on the project implementation, a method to improve the positioning accuracy of indoor location algorithm based on WiFi location feature matching is put forward. 1) adding filter method in the stage of characteristic library establishment, after data acquisition is completed, the AP signal of each acquisition point is judged by counting the times of each AP collected at each acquisition point, and then the AP signal of each acquisition point is ruled out. In order to filter the data, eliminate the data errors introduced in the process of establishing the signature database, and improve the positioning accuracy. 2) after adding the correction method in the positioning stage, the displacement of the positioning target from the last correct positioning to this time is calculated through the acceleration sensor and the timer brought in by the mobile phone. At the same time, the distance between the current location result and the last correct location result is calculated. If the difference between the two distances is larger than the positioning error of the positioning system, then the result of this location is wrong, so it needs to be repositioned to achieve the purpose of correction. A WiFi indoor positioning system based on Android system is designed and implemented. 1) requirement analysis of the system; 2) data collection and analysis; 3) the design and implementation of the system signature library; 4) the design and implementation of positioning function. The system designed and implemented in this paper can be easily applied to some large exhibition halls, shopping malls, hospitals and other indoor environments, to provide users with accurate positioning services, to help users save time to find.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN92

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本文編號：1527347