基于CSI測距的輕量級指紋室內(nèi)定位技術(shù)研究
[Abstract]:With the popularity of Wi-Fi and mobile devices, indoor positioning based on Wi-Fi has attracted more and more researchers'attention. Received Signal Intensity Indicator (RSSI), as a mainstream scheme, is often used in ranging-based positioning systems and fingerprint positioning systems. In recent years, devices (such as Intel 5300 wireless adapters) have supported the acquisition of channel states in the physical layer. Information (CSI). CSI is an indicator that can characterize signal characteristics with finer granularity than RSSI. It opens up a new space for Wi-Fi-based indoor positioning technology and attracts the attention of many researchers. This paper studies indoor positioning based on CSI. The main contributions are as follows: 1. A lightweight fingerprint positioning scheme based on CSI ranging, RanLi Fi (RanLi Fi) Range-based Lightweight Fingerprint) scheme, including pre-processing phase, offline phase and online phase. The pre-processing phase will be carried out before offline and online phase, used to process stable data, offline phase to build indoor fingerprint map, online phase to complete ranging and fingerprint matching and get the location of the target. A novel ring sampling point strategy is proposed, which combines the ranging-based localization method with the fingerprint-based scheme. The fingerprint scheme compensates for the low precision of the ranging scheme and reduces the cost of fingerprint matching in the fingerprint scheme. Then the fingerprint matching range is reduced to a loop with the wireless access point as the center and the radius closest to the D value. Finally, the position of the fingerprint with the highest matching degree is taken as the target position. 2. Based on Papanico coefficient method, a B-AoE (Bhattacharyya based Average of Energy of Interest) fingerprint is proposed. The B-AoE fingerprint can satisfy the requirement that the same location is sufficiently similar and different locations are easy to distinguish. In the off-line and on-line phases of RanLiFi, the obtained CSI data are generated into B-AoE fingerprint.3. In order to accurately measure the distance, a base is proposed. The adaptive propagation model of energy of interest is called S-EoI (Self-adaptive and Energy of Interest based) model. It is found that the line-of-sight path and non-line-of-sight path signals can not be separated accurately under the condition of 20 MHz bandwidth. Moreover, the attenuation degree of each signal transmission is different even in the same indoor environment. Based on this, this paper defines an energy of interest which is stable and can reflect the changes of the environment, and gives an adaptive method to calculate the path loss coefficient of each signal transmission. The biggest advantage of S-EoI model is that it does not need to train the parameters of different indoor environments and adaptively uses the path loss coefficient. The system includes data acquisition module, pre-processing module, fingerprint map construction module and positioning navigation module, and supports fault-tolerant mechanism and feedback mechanism to ensure the practicability and stability of the system. The data acquisition module uses Intel 5300 wireless network card to acquire the original CSI data, preprocessing module, fingerprint map construction module and positioning and navigation module respectively implement the methods in the pre-processing stage, off-line stage and online stage of Ran Li Fi scheme. The performance of RanLiFi positioning system is evaluated from various angles. The experimental results show that the proposed S-Eo I ranging scheme has an average error of 1.7 meters, and the B-AoE fingerprint scheme can be correctly positioned in 98% of the cases. With the support of fault-tolerant mechanism, RanLi-Fi system can achieve an average positioning accuracy of 0.8 meters, and its time performance reaches second level.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN92
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