基于UWB技術(shù)的TDOA定位算法的研究與實(shí)現(xiàn)
[Abstract]:With the development of information technology, people depend more and more on spatial location information. For example, ultrasonic positioning technology RFID (Radio Frequency Identification) positioning technology Bluetooth positioning technology WiFi positioning technology ZigBee positioning technology and ultra-wideband positioning technology and so on. As a result, there are many algorithms, such as TDOA and TDOA, and so on. The introduction of these localization techniques and their advantages and disadvantages are briefly introduced in the second chapter of this paper, and the above algorithms are also introduced and compared in the third chapter of this paper, so they are not introduced one by one. Therefore, the rapid development of positioning technology also shows the great demand for location. In this paper, we will study and implement the TDOA localization algorithm, which is commonly used in UWB positioning system. In fact, the location algorithm is based on the difference of time between the received signals of each base station. Usually we get the time when the base station receives the signal, and then determine the distance from the signal source to the base station, then draw a circle according to the distance between the signal source and the base station, and the intersection point between the two circles is the position of the signal source. Because the absolute time is generally not easy to measure, the time difference between the signal and the base station can be measured. Taking the base station as the focus, the hyperbolic curve is established. The time difference of arrival multiplied by the speed of light is the distance difference between the two base stations and the signal source, then the point on the hyperbolic curve of the signal source. The intersection point of several hyperbolas is the position of the signal source, which is the hyperbolic mathematical model. In this paper, the development of UWB positioning technology at home and abroad is discussed, and its knowledge theory is studied and understood. The commonly used positioning performance index is also introduced briefly. Then, the theoretical knowledge and mathematical model of the main content of the TDOA localization algorithm in this chapter are studied in depth, and the clock synchronization between the base stations required by the TDOA localization algorithm is also studied. A wireless clock synchronization algorithm based on Kalman filtering algorithm is proposed and the corresponding mathematical model is established. The simulation results show that the synchronization effect between base stations is very good under the Kalman filtering algorithm. Finally, the nonlinear equations obtained by TDOA localization algorithm are solved. In this paper, two classical position estimation algorithms, called: Fang algorithm and Chan algorithm, are introduced. The simulation results show that Chan algorithm is more effective than Fang algorithm. Because the Fang algorithm can not use the redundant base station information to estimate, and the Chan algorithm can use the redundant information to estimate, so the Chan algorithm can improve the location accuracy by adding the base station. The simulation results also show that the Chan algorithm can improve the location accuracy by increasing the number of base stations, but when the number of base stations reaches a certain number, the improvement of location accuracy is not obvious. Therefore, the demand for the number of base stations in practical engineering applications of Chan algorithm depends on the situation.
【學(xué)位授予單位】:海南大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TN925
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