The upper-limit of the positioning dilution of precision(PDOP) is an important index to design of a navigation constellation and evaluation of its performance.
定位精度因子（PDOP）上限取值是导航星座设计及其性能评价的基本依据。
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.
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。
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