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提出了北斗地基增强系统(Ground-based Augmentation Systems,GBAS)的着陆系统(GBAS Landing System,GLS)信号覆盖评估方法,从卫星对地覆盖及甚高频数据广播电台(VHF Data Broadcast,VDB)信号覆盖两方面进行评估.卫星对地覆盖评估中首先利用网格点分析法和视函数法评估卫星对地覆盖重数及4个覆盖性能指标:覆盖百分比、最大覆盖间隙、平均覆盖间隙及时间平均间隙,然后从用户角度分析卫星覆盖问题(卫星可见性).VDB信号覆盖评估中,对电磁波传播过程综合考虑了地球曲率及地形影响.另外,综合考虑目标机场的卫星可见性及VDB信号覆盖范围,结合美国联邦航空管理局规定的VDB信号最小覆盖空域,给出了本文评估方法在VDB选址中的应用.仿真结果表明该方法可以合理确定北斗GLS信号的覆盖情况及VDB位置.
The GBAS Landing System (GLS) signal coverage assessment method is proposed, which is based on satellite coverage and VHF Data Broadcast (VDB) signals Covering two aspects of the assessment.Satellite ground cover assessment first use of grid point analysis and visual function method to assess the satellite ground cover weight and coverage of four performance indicators: coverage percentage, the maximum coverage gap, the average coverage gap and the time average Gap and satellite coverage from the user’s point of view (satellite visibility). In the assessment of the coverage of the VDB signal, the curvature of the earth and the topography are taken into account in the electromagnetic wave propagation process. In addition, considering the satellite visibility of the target airport and the VDB signal coverage , Combined with the minimum covered airspace of VDB signal regulated by the Federal Aviation Administration, the application of this evaluation method in VDB site selection is given.The simulation results show that this method can reasonably determine the coverage and VDB position of Beidou GLS signal.