双系统卫星导航增强系统研究

Study on Satellite Navigation Augmentation of Double Systems

提出了对双系统组合定位的增强方法，详细研讨了双卫星导航增强系统方案。该方法提高了卫星导航系统信息的安全性，在特殊时期，在某一系统不能使用时（如GPS），仍能利用其它卫星导航系统提供定位服务；通过地面差分修正站播发双卫星导航系统之间的系统时差以及地面差分修正站视界内所有卫星的伪距修正量，提高了卫星导航设备的可用性和定位精度；同时增加了信号的完好性，提供的冗余信息增加，使接收机自主完好性监测（RAIM）方法更易鉴别出故障卫星。

The paper puts forward an integrated positioning method and analyses the performances of the satellite navigation augmentation of double systems. The method enhance the data security of navigation system, and in some case, the other also can provide positioning service when one set of satellite navigation system is fault The differential correction station on the ground broadcast time error and pseudorange correction error of visible satellite between two sets of navigation systems, and enhance usability and positioning precision of navigation facility. Simultaneously, it can provide more integrity and continuity datum, so as to the RAIM system can be easier to detect fault satellite.