0引言GPS技术在定位、导航等方面凸显出了重要的作用,然而城市建设对该技术的应用造成一定的阻碍,高层建筑的建设使城市内形成了峡谷,继而影响了卫星可视的范围,而广布于城市各个角落的Wi-Fi则可以很好的弥补这一不足。Wi-Fi的普及使其在定位系统中的参与成为可能,然而Wi-Fi却并不能够对高程方向予以准确的判断与辨别,因此如何将高程信息附加到GPS定位中是一项值得研究的课题。1 Wi-Fi辅助下的定位研究最初研究的Wi-Fi定位主要针对室内定位问题展开,基于 0 Introduction GPS technology has played an important role in positioning, navigation and other aspects. However, urban construction has caused some obstacles to the application of this technology. The construction of high-rise buildings has led to the formation of canyons in the city, which in turn has affected the visual range of satellites. Wi-Fi, which is widely distributed in every corner of the city, can make up for the problem. The popularity of Wi-Fi makes it possible to participate in the positioning system. However, Wi-Fi can not accurately judge and distinguish the elevation direction. Therefore, how to attach elevation information to GPS positioning is a worthwhile study Question. 1 Wi-Fi-Assisted Location Study The initial study of Wi-Fi location focused on indoor location issues, based on