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.
本研究设计了适用于GPS单点定位计算的BP人工神经网络模型结构，采用共轭梯度算法改善网络的训练速度和精度。
The BP network architecture applied to determine GPS standalone position is designed. Meanwhile, the conjugate gradient algorithm is used to improve the training velocity and accuracy of the network.
介绍了精密单点定位的精度和研究现状，分析了其优越性，展望了在航道测量方面的应用可行性。
This paper introduces the precision and current research status of precise point positioning (PPP), analyses its advantage, and the feasibility of PPP used in Shipping Lane Survey was expected.
几何精度衰减因子gdop和卫星信噪比SNR等多方面因素的影响，增大了GPS单点定位误差。
GPS positioning accuracy is influenced by Geometric Dilution of Precision (GDOP), Signal Noise Ratio (SNR) and so on.
几何精度衰减因子gdop和卫星信噪比SNR等多方面因素的影响，增大了GPS单点定位误差。
GPS positioning accuracy is influenced by Geometric Dilution of Precision (GDOP), Signal Noise Ratio (SNR) and so on.
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