为了提高单频gps单点定位精度，提出一种基于星间求差的GPS自差分方法。
In order to improve the precision of the single frequency GPS, a method to achieve self-difference based on difference between satellites is presented.
根据目前单点定位精度给起始点加上适当的坐标偏差，研究起始点坐标偏差对基线处理结果的影响。
Basing on current single point positioning precision, certain coordinate error is added into fixed points to study the result.
针对实验室现有的设备，分别对单点定位误差和区域定位误差进行试验、分析，对不同GPS使用精度进行比较。
Based on the facility the lab owned, we analyze single error and region error and compare different GPS precision.
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