本文从工程实际出发，分析了影响电液位置伺服系统精度误差的来源，并对各主要因素作了定量的分析计算。

This paper analyzes the sources of effecting the error of the accuracy in electrohydraulic position servo system, and carries out quantitative analysis and calculation to main factors.

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并对系统最大误差位置进行误差参数灵敏度分析。用蒙特卡洛法进行精度综合。

The sensitivities of error parameters were analyzed at the maximum error position, and accuracy synthesis was conducted by using Monte Carlo method.

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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。

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.

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