GBAS中基于导航星监测的B值修正算法

GBAS推动了空中交通管理系统由路基导航向星基导航过渡,其中多参考一致性检测(MRCC)的B值是GBAS地面完好性检测的核心算法.本文提出基于导航星监测的B值修正算法,通过定义卫星伪距修正量误差估计值S值对导航星监测,利用高斯膨胀-Shewhat法推导S示警阈值,结合S值检测并标记故障卫星,形成新的可用卫星集合,避免由于B值无法有效反映具有较大偏差的卫星伪距修正量的误差估计而造成MRCC执行逻辑对接收机的整体剔除,对B值形成修正作用.实验证明,新算法可有效监测卫星故障,修正B值,提高M RCC监测能力并提高系统可用性.

B Correction Algorithm in GBAS Based on Navigation Satellites Monitoring Information

Ground based augmentation system (GBAS) promotes the transition of air traffic management system from roadbed navigation to satellite-based navigation， in which B for multi-reference consistency check (MRCC) is the core algorithm in GBAS. The B correction algorithm is proposed based on the navigation satellites monitoring. The satellite pseudorange correction error S estimated is defined to monitor navigation satellites.With the methods of Gauss expansion-Shewhat， S warning threshold is derived. According to S value detected and fault satellites， a new collection of available satellites is formed， thus it is avoided that the whole receiver may be eliminated by the execution logic of MRCC because the B value cannot effectively reflect a large deviation of satellite pseudorange correction error estimated， which means the B values can be corrected. Experimental results show that the satellite fault can be monitored effectively in the new algorithm， and B value can be corrected， so as to improve the monitoring capacity of MRCC and increase system availability.