Then according to the voidness of GPS satellites in different position, the effect on navigation accuracy of GPS(that is GDOP)is studied. The validity of voidness strategy is proved by simulation.

首先分析了GPS卫星对特定区域的覆盖情况，然后针对不同位置的GPS卫星失效，考察对GPS导航精度即目标区域GDOP值的影响，并通过仿真予以验证。

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For the test requirement of precision agriculture, differential systems of GPS position were adopted to increase the position accuracy of GPS system.

为了精准农业技术示范试验需要，采用了GPS定位差分系统，以提高GPS系统定位精度。

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The distribution of the GPS leveling points obviously affects the accuracy of interpolated GPS height.

水准联测点的分布状况对GPS高程的拟合精度有明显影响。

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The Pioneer SmartCradle for iPhones is compatible with all GPS enabled apps, including MotionX-GPS Drive and is the first of its kind to incorporate a built-in gyro sensor and accelerometer combined with an external antenna for improved GPS reception and location accuracy, even if GPS signals are limited by high rise buildings and tunnels.

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America is planning to improve its satellite-navigation system further: next year, it will start launching a second generation of GPS satellites, which will offer greater accuracy for civilian users and, for military purposes, greater protection against the signal being jammed by an enemy.

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For example, researchers in Arizona are using real-time kinematic global positioning systems, an ultra-precise version of GPS that can measure positions with sub-inch accuracy levels, to control weeds in cotton fields with steel cultivators.

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