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论述了“北斗一号”卫星导航系统存在的不足,对于“北斗二号”区域卫星导航系统及其所采用的三种导航卫星进行了介绍。通过对所选区域及六个有代表性城市的几何精度衰减因子(GDOP)和可见星数进行仿真,验证了系统的可用性。同时,仿真表明系统对于我国部分地区的覆盖相对较差,部分时间段内的GDOP波动较大,说明系统中卫星的相对位置还应进行调整。
This paper discusses the shortcomings of “Beidou No.1” satellite navigation system and introduces the “Beidou II” regional satellite navigation system and its three navigation satellites. The system usability is verified by simulating the geometric precision attenuation factor (GDOP) and visible stars in the selected area and six representative cities. At the same time, the simulation shows that the system coverage is relatively poor for some areas in China, and the GDOP fluctuates greatly in some time periods, indicating that the relative positions of satellites in the system should also be adjusted.