Secondly, the phase synchronization error can not overrun a limit which is requested by elevation accuracy demand during the whole interferometric data acquirement time.

二是在整个干涉数据的录取时间里，主动和被动两个雷达载波相位同步误差不能超过高程测量的精度要求所允许的误差。

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Results revealed that the accuracy of interpolation was obviously improved when elevation and slope were combined.

结果表明，结合海拔、坡度进行插值后，精度有明显提高。

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So it's always a hot topic how to transform GPS ellipsoidal height into level elevation and to keep certain accuracy.

如何将GPS大地高转化咸水准高程，并使其保持一定的精度，一直是人们研究的热点。

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