摘要
地基增强系统(GBAS)服务于与生命安全相关应用时,有必要开展对流层异常监测以保证导航精度和完好性。观测域最大可容忍对流层延迟和对流层异常概率是设计GBAS对流层异常完好性监测体系的关键参数。本文以满足适航需求为基础,实现定位域所需导航性能与观测域所需监测性能之间的转换,基于最差保护原则实现了观测域最大可容忍对流层延迟的量化。欧洲中尺度天气预报中心(ECMWF)2010—2019年的气象数据被用于对流层反演分析,验证了对流层波导异常和非标称对流层延迟2类故障发生概率。使用北斗真实数据和气象数据开展仿真验证,结果表明:为保障GBAS支持的精密进近和着陆服务完好性和可用性,观测域最大可容忍对流层延迟取值范围为0.57~0.92 m(对应下滑角θ=2.5°~3.5°);沿海地区,对流层波导异常概率处于10%~50%之间,但其对GBAS完好性影响较低;非标称对流层延迟概率保守设置为5.3×10^(−3),以保证GBAS完好性。上述仿真结果为对流层异常完好性监测器设计和GBAS完好性监测体系完善提供了重要参考。
Troposphere anomaly must be monitored to ensure navigation accuracy and integrity when the GroundBased Augmentation System(GBAS)provides services for safety-critical applications.The maximum tolerable tropo⁃sphere delay in measurement domain and the troposphere anomaly probability are the critical parameters for GBAS troposphere anomaly integrity monitors.In this paper,the required navigation performance in the position domain is translated into the required integrity monitoring performance in the measurement domain from an airworthiness per⁃spective.The maximum tolerable troposphere delay in the measurement domain is quantified based on the worst pro⁃tection principle.The probabilities of troposphere duct anomaly and non-nominal troposphere delay are evaluated us⁃ing the meteorological data from European Center for Medium-range Weather Forecasts(ECMWF)during 2010-2019.Real BDS data and meteorological data are used to carry out simulation.The experimental results show that to ensure the integrity and availability of precise approach and landing services supported by GBAS,the maximum toler⁃able troposphere delay in the measurement domain ranges from 0.57 to 0.92 m(corresponding glide angleθ=2.5°-3.5°).The prior probability of troposphere duct anomaly is between 10%-50%in most coastal areas,but its impact on the integrity of GBAS is negligible.The prior probability of non-nominal troposphere delay can be conservatively set as 5.3×10^(−3) to improve the integrity of GBAS.The results can provide an important reference for the design of tropo⁃sphere anomaly integrity monitor and the improvement of GBAS integrity monitoring system.
作者
李家祥
程建华
李亮
那志博
贾春
LI Jiaxiang;CHENG Jianhua;LI Liang;NA Zhibo;JIA Chun(College of Intelligent Systems Science and Engineering,Harbin Engineering University,Harbin 150001,China)
出处
《航空学报》
EI
CAS
CSCD
北大核心
2024年第7期203-215,共13页
Acta Aeronautica et Astronautica Sinica
基金
国家重点研发计划(2021YFB3901300)
国家自然科学基金(61773132,61633008,61803115,62003109)。
作者简介
通信作者:李亮.E-mail:liliang@hrbeu.edu.cn。
