在应用中，常常会遇到时间同步、远近效应、几何精度衰减因子等问题。
In the applications, there are many problems, such as timing synchronization, near - far effect, and geometric dilution of precision.
进一步分析了雷达辐射源位置、星座几何形状和星座的卫星高度对几何精度衰减因子的影响。
Then, the effects of radar beacon position, cluster geometry and satellite altitude on the geometry dilution of precision factor are analyzed.
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.
一般的GPS选星方法通过搜索选取使几何精度衰减因子最小的4颗卫星，对于高动态应用特别是在水平姿态角较大的情况下，传统的选星方法存在许多局限性。
Traditional GPS satellite selection algorithm uses only 4 satellites with minimal Geometric Dilution of Precision(GDOP)and doesn t work well in high dynamic conditions.
提出了基于切换增益衰减因子的变切换增益变结构控制律，实现了高精度的分布式卫星构型保持鲁棒控制，较好地克服了误差收敛时间和控制精度的矛盾；
The robust precise formation keeping of the DSS was realized based on the control law, and the conflict between control time and control precision was conquered using the control law.
提出了基于切换增益衰减因子的变切换增益变结构控制律，实现了高精度的分布式卫星构型保持鲁棒控制，较好地克服了误差收敛时间和控制精度的矛盾；
The robust precise formation keeping of the DSS was realized based on the control law, and the conflict between control time and control precision was conquered using the control law.
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