GPS信號可用性評價及定位精度改善方法研究
[Abstract]:GPS has been widely used in various fields from the initial military application to the present. It has made great progress and is closely related to people's life. And the early GPS system has also made great progress in technology, whether it is timing or positioning navigation, in ideal conditions, its accuracy can meet the needs of people. But in the actual condition, especially in the city with high buildings, there are many kinds of occlusion, including the higher floor, the viaduct, the big tree beside the road, and the multipath effect of GPS signal, so the GPS signal is not available in real time. Positioning accuracy is also greatly affected. In this paper, the usability evaluation of GPS signal and the improvement of GPS positioning accuracy are studied. Firstly, several factors related to the availability of GPS signal are introduced, including the accuracy factor of GPS location and the influence of multipath effect. The usability of GPS signal is analyzed by using GPS signal receiving and processing software written on the platform of labview of NI company. Some regional experimental data are collected for a period of time, and the availability of GPS signal is calculated. The relationship between the availability of GPS signal and the accuracy factor, the number of satellites and so on is observed. Secondly, the positioning accuracy of GPS signal is affected by the occasional occlusion and interference in real environment. Dynamic filtering is an important method to eliminate the random error of GPS. In this paper, extended Kalman filter is applied to GPS positioning system. The mathematical model of GPS positioning system is established, and the real value of the selected state is estimated from the random disturbance. In the experiment, the GPS signal receiving and processing software is combined with the extended Kalman filter model, and the filtering process is realized by matlab. The results show that the established GPS positioning system model is accurate, and it can improve the positioning accuracy of GPS. In a word, through the research of GPS usability evaluation and the application of extended Kalman filter to GPS positioning system, the factors that affect the availability of GPS signal are studied, and the location accuracy of GPS receiver is improved by using extended Kalman filter algorithm. It has some reference value in the application field of navigation and positioning.
【學位授予單位】:沈陽航空航天大學
【學位級別】:碩士
【學位授予年份】:2013
【分類號】:P228.4
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