基于BLE室內(nèi)定位關(guān)鍵技術(shù)研究與開發(fā)
[Abstract]:With the rapid development of wireless communication technology and computer field, there is more and more demand for location. However, the environmental conditions of large-scale shopping malls and other places will have a certain impact on the signal propagation of GPS positioning system, so it is difficult to achieve the desired positioning effect. So this paper carries on the analysis and the simulation test to this localization scene, makes under this environment also has the better localization effect. Firstly, this paper makes a comparative analysis of the research background and the current research situation of indoor positioning at home and abroad. By expounding and analyzing the advantages and disadvantages of the current mainstream indoor positioning technology, the bluetooth 4.0 technology with low power consumption, anti-interference and long distance is used to build the hardware of the system platform. Then the bluetooth 4.0 technology is introduced and elaborated in detail, and the network and system structure of Bluetooth are explored, and one master multi-slave networking mode is adopted, which is also the precondition to establish ranging model and verify the validity of location algorithm. Secondly, the positioning method based on range measurement is adopted in this paper. According to the indoor environment, a path loss model based on the received signal strength indicator (Receive Signal Strength Indicator,RSSI) is established. The RSSI value collected is easily interfered by indoor multipath effect, which leads to the appearance of coarse error data or random error data. In this paper, the Lajda test combined with Kalman filtering algorithm is used to filter the resulting error data, and then an accurate path loss model is constructed. Finally, based on the theoretical analysis, this paper designs an optimized weighted quadrilateral positioning algorithm to carry out the final indoor positioning analysis and testing. Because of the deficiency of the weighted quadrangle localization algorithm, the proportion of the weighted value is analyzed, and the optimal weighted value parameter is obtained through the experimental data verification. On the basis of establishing a more accurate path loss model, the corresponding measurement points are set up in the laboratory. The data acquisition and location analysis are carried out by using more trilateral measurement methods, weighted centroid localization algorithm and optimized weighted four-edge localization algorithm. Through the analysis of the final positioning data, it is verified that the optimized indoor positioning algorithm has a good positioning effect in the actual environment, and the positioning accuracy is basically within 0.6 meters, which meets the requirements of the current indoor positioning.
【學(xué)位授予單位】:昆明理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TN92
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