伪卫星辅助下的北斗GBAS完好性增强技术研究

Research on Beidou GBAS Integrity Enhancement Technology Based on Pseudo Satellite

根据机场实施精密导航技术(RNP)的要求,国际民航组织(ICAO)提出地基增强系统(GBAS),GBAS必将成为未来发展的必然趋势。但是在复杂的机场环境下,卫星信号易受外界影响和干扰,连续性不足,进而影响GBAS系统完好性性能的实施。因此,本文提出了伪卫星与北斗卫星联合定位增强GBAS的方法,并从加入伪卫星后的精度因子(DOP)、多参考一致性检测(MRCC)、完好性等方面进行了对比仿真分析。仿真结果表明,增加伪卫星后的系统精度因子得到了明显改善(PDOP小于3),同时提高了完好性性能,能够为复杂环境下的机场提供GBAS CATⅡ类及以上等级的精密进近服务。

According to the requirements of precision navigation technology （ RNP ）, the International Civil Aviation Organization （ICAO） proposed the GBAS, which will become the inevitable trend of future development. But in the complex environment of the airport, the satellite signal is susceptible to outside influence and interference, lack of continuity, thereby affecting the implementation of GBAS system integrity performance.Therefore, the method of combining pseudo satellite and BeiDou satellite to enhance GBAS is proposed.The simulation results are compared with the precision factor （DOP）, multiple reference consistency detection （MRCC） and integrity of the pseudo satellite.The simulation results show that the precision of the system is improved obviously after the increase of the pseudo satellite （ PDOP less than 3）, at the same time the new method improves the integrity of the performance, and can provide CAT 11 class and above grade precision access services of GBAS in the airport of sophisticated environment.