| The demand for location and navigation is increasing, Bluetooth location accuracy can achieve submeter, and the growing popularity of Bluetooth devices provides basis hardware for Bluetooth location, but in practical applications it still exists low location accuracy, high cost, vulnerable to interference and other issues. Therefore, the study of new Bluetooth location algorithm has important significance to the application of Bluetooth technology.Paper is Constructting the signal acquisition system by mobile devices and Bluetooth devices, designing accessional mobile clients and service management system, using the characteristics of Bluetooth 4.0 technology, such as low power consumption, long distance features, studying new Bluetooth location algorithms, to build location system based on Bluetooth 4.0.The main work includes:Study and improve the adaptive Bluetooth location algorithm based on kernel ridge regression proposed by Jiang Dexiang etc in 2010, propose Bluetooth location algorithm based on wavelet kernel ridge regression, establish regression model by signal strength between bluetooth beacon nodes and physical location information, collect real-time information to update the model parameters to achieve high precision adaptive Bluetooth location.Propose a free calibration triangular centroid location algorithm based on receiving power. The algorithm uses the wireless signal receiving power parameters instating of the traditional RSSI, apply to measuring model, and combine with the traditional triangle centroid location model, so as to reduce the measurement error and improve the accuracy of location.Set up a location system based on Bluetooth 4.0, which includes signal acquisition system, mobile client and server, apply the new location algorithms to it.Through the performance testing and functional testing of the system, the results show that the system design is reasonable, basically meet the purpose of design and user requirements. |
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