But in urban skyscrapers, flyovers, runnels and other special areas, GPS positioning information is often interrupted, or positioning accuracy greatly reduced.
但是在城市高楼区、立交桥、隧道等特殊地段，GPS的定位信息常常中断或者定位精度大大降低。
The acquisition of GPS positioning information, method of area calculation for polygon fields, and design of hardware and software of the instrument were also introduced.
给出了GPS定位信息的获取技术，多边形农田面积的计算方法，测量仪软硬件的设计原理等。
Through combining dead reckoning, GPS positioning information and Map-Matching algorithm, this paper represents an algorithm to correct sensors parameters in In-Vehicle Navigation System.
针对车载组合导航信息融合的高精度、高可靠性等要求，提出了一种组合导航的自适应集中滤波算法。
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