GPS可用性建模与仿真

Modeling and Simulation about GPS Availability

在考虑地球遮挡、导航信号自由空间衰减、导航卫星转发天线波束对地张角、接收机遮蔽角及大气层衰减等因素的影响下,对GPS导航星的空间可见性和信号的可用性进行了分析。分别给出了具体的GPS导航星空间可见性分析模型、接收机遮蔽角约束、信号衰减模型和GPS可用性分析判据,并结合典型应用背景对GPS导航的空间可用性进行了仿真分析。所采用的分析模型、方法及仿真结论对GPS在空间任务中的应用有一定的参考价值。

The visibility and usability of GPS signal for space missions were analyzed. The influencing factors such as earth occultation, the free space signal attenuation, the beam width （or solid angle） of transmitting antenna, the receiver mask angle and the atmospheric attenuation were analyzed and modeled in detail. And the criterions of space visibility and usability of GPS signal in space were also given. The relative simulations were proposed for the special application background. The analysis methods, models and simulation results have special reference value for the application of GPS in the space missions.