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。
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.
该方法同时考虑了参数误差与几何淡化因子对定位精度的影响，不需要矩阵求逆，运算量小，速度快。
The method is characterized by light computational load and short time because it does not need to calculate the inverse of matrix.
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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