在城市车辆导航过程中，多径误差是近距离差分gps等高精度定位的主要误差源。
In the application of vehicle navigation in city area, Multi-path errors are the main error source of GPS high-precision differential positioning in a near distance.
改变源片距离和曝光剂量，进一步突出所能发现的误差，确定最佳曝光条件；
Then, exposure conditions including the exposure dose and source to film distance were changed to find the optimal one.
在长距离GPS实时动态定位(rtk)过程中，电离层延迟误差是影响定位精度的主要误差源。
The ionospheric delay error is a major error source which degrades the positioning accuracy in network real time kinematic (RTK) positioning over a long distance.
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