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。

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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。

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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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Even today in the world of satellite based GPS and the fairly exact positioning information it can provide, it is always best to have a paper chart or map and the needed tools in case your electronic ones fail so you are not left stranded and unable to find your way home.

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Ultimately, the Compass Navigation System could be used worldwide to provide precise positioning data for the Chinese military similar to information already produced by the U.S. GPS for military field commanders.

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