局域差分gps认为在距离参考站较近的区域内，观测误差具有相关性。参考站将观测量与理论值之差作为差分改正数发送给用户进行差分改正。
Using GPS observation data from differential GPS reference stations, several errors, which can't modeled, were solved and sent to user around these reference station.
本文采用观测值曲线的分段拟合方法，对北京地区部分断层位移测量资料进行处理。
Using separation stage for fitting of observational curves in this paper, the surveying data of fault displacements of Beijing area has been analyzed.
采用测距三角高程法进行跨河水准测量，可以不量取仪器高，但观测值中有两类不同的观测量。
When completed river crossing leveling by means of trigonometric leveling with distance measurement, there are two types of observed values.
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