本文推导了星载测定外方位元素参与下，无地面控制点卫星摄影测量高程误差估算公式。
This paper deduces elevation error estimating formulae of the satellite photogrammetry, which is concerned with elements of exterior orientation that measured by spaceborne sensors.
由此总结出在云南高原地区进行红外仪三角高程代替三、四水准，所产生误差的规律性，并制定一套较实用的操作规程。
The regularity of error and practical instructions are summarized for using infrared range-measurement system instead of the third of fourth grade levelling on Yunnan Plateau.
在数字高程模型(DEM)允许误差的条件下，一定存在最优基线使得DEM精度最佳。
In the condition of acceptable Digital Elevation Model (DEM) error, there must be an optimal baseline which makes DEM precision highest.
分析了单向光电三角高程测量的误差来源，在此基础上推导了最佳测站位置离测点的平距公式。
Based on the error resource analysis in one-way photoelectric triangulated heigh survey, the horizontal distance equation is drawn for optimal station away from survey point.
实验结果表明，该策略能够显著提高程序性能，平均提高一倍，甚至更高，同时它能够预知优化后程序执行时间的变化，最高误差为2%。
Experimental results show that the scheme has ability to improve significant performance significantly, and predict the application's execution time after optimization with a maximum error of 2%.
摘要 ：使用距离多普勒模型进行SAR影象几何校正时，卫星轨道误差、系统成像参数误差和DEM高程的误差会影响几何校正精度。
Abstract : When using the Range-Doppler model for SAR image geometric correction, the error of satellite orbit, imaging parameter and DEM elevation will affect the geometric correction accuracy.
三大同步中，相位同步误差直接影响SAR复影像的相位误差，从而影响系统的高程测量精度。
The error of phase synchronization among the three synchronizations will affect the phase error of SAR SLC image directly, and influence the elevation measurement precision sequentially.
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。
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。
Secondly, the phase synchronization error can not overrun a limit which is requested by elevation accuracy demand during the whole interferometric data acquirement time.
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