Today,green and low-carbon development and technological innovation are mingling in what may emerge as the key narrative for human civilization.I was fortunate enough to have attended the 2024 Greater Bay Area(GBA)Sci...Today,green and low-carbon development and technological innovation are mingling in what may emerge as the key narrative for human civilization.I was fortunate enough to have attended the 2024 Greater Bay Area(GBA)Science Forum’s Green Energy Industry Innovation Sub-Forum and then the 2025 Zhongguancun Forum(ZGC Forum)Annual Conference.展开更多
Antenna Group Delay Variation(AGDV)is a hardware error source that affects the performance of Dual-Frequency Multi-Constellation(DFMC)Ground-based Augmentation System(GBAS),and these errors are difficult to distinguis...Antenna Group Delay Variation(AGDV)is a hardware error source that affects the performance of Dual-Frequency Multi-Constellation(DFMC)Ground-based Augmentation System(GBAS),and these errors are difficult to distinguish from multipath errors.Currently,AGDV is usually modeled as a part of the multipath error,which is called the multipath-AGDV model.However,because of the inconsistency of AGDV and multipath when switching among different positioning modes of GBAS,and because the traditional model does not consider the impact of the azimuth on AGDV,using the traditional multipath-AGDV model will cause the protection levels to be inaccurately calculated.In this paper,azimuth-based modeling of AGDV is conducted by using anechoic chamber measurements.The biases and standard deviations of AGDV based on azimuths are analyzed and modeled,and the calculation method for the DFMC GBAS protection level is optimized.The results show that the azimuth-based AGDV model and protection level optimization algorithm can better avoid the error exceeding the protection level than the multipath-AGDV model.Compared with AGDV elevation model,the VPLs of the B1C signal are increased by 0.24 m and 0.06 m,and the VPLs of the B2a signal are reduced by 0.01 m and 0.16 m using the 100 s and 600 s DFree filtering positioning modes,respectively.The changes in the B1C and B2a protection levels reflect the changes in AGDV corresponding to the azimuth for the respective frequencies,further ensuring the integrity of airborne users,especially when they turn near the airport.展开更多
本文介绍了GBAS和其进近服务类型,详细介绍了基于GPS单频实现III类运行的GAST D GBAS技术概念框架,研究了地面设备完好性监测框架和播发电文以及机载设备新增算法和监测器设计.针对电离层异常对GBAS运行的影响,根据电离层梯度异常模型,...本文介绍了GBAS和其进近服务类型,详细介绍了基于GPS单频实现III类运行的GAST D GBAS技术概念框架,研究了地面设备完好性监测框架和播发电文以及机载设备新增算法和监测器设计.针对电离层异常对GBAS运行的影响,根据电离层梯度异常模型,模拟了故障场景,设计实现了GAST D地面和机载仿真验证平台,并对模拟的故障场景下GAST D GBAS系统进行验证和分析.展开更多
文摘Today,green and low-carbon development and technological innovation are mingling in what may emerge as the key narrative for human civilization.I was fortunate enough to have attended the 2024 Greater Bay Area(GBA)Science Forum’s Green Energy Industry Innovation Sub-Forum and then the 2025 Zhongguancun Forum(ZGC Forum)Annual Conference.
基金the National Key Research and Development Program of China(No.2023YFB3907001)the financial support from the National Natural Science Foundation of China(Nos.62371029,U2233217 and 62101019)the Civil Aviation Security Capacity Building Fund Project of China(Nos.CAAC Contract 2021(77)and CAAC Contract 2022(110)).
文摘Antenna Group Delay Variation(AGDV)is a hardware error source that affects the performance of Dual-Frequency Multi-Constellation(DFMC)Ground-based Augmentation System(GBAS),and these errors are difficult to distinguish from multipath errors.Currently,AGDV is usually modeled as a part of the multipath error,which is called the multipath-AGDV model.However,because of the inconsistency of AGDV and multipath when switching among different positioning modes of GBAS,and because the traditional model does not consider the impact of the azimuth on AGDV,using the traditional multipath-AGDV model will cause the protection levels to be inaccurately calculated.In this paper,azimuth-based modeling of AGDV is conducted by using anechoic chamber measurements.The biases and standard deviations of AGDV based on azimuths are analyzed and modeled,and the calculation method for the DFMC GBAS protection level is optimized.The results show that the azimuth-based AGDV model and protection level optimization algorithm can better avoid the error exceeding the protection level than the multipath-AGDV model.Compared with AGDV elevation model,the VPLs of the B1C signal are increased by 0.24 m and 0.06 m,and the VPLs of the B2a signal are reduced by 0.01 m and 0.16 m using the 100 s and 600 s DFree filtering positioning modes,respectively.The changes in the B1C and B2a protection levels reflect the changes in AGDV corresponding to the azimuth for the respective frequencies,further ensuring the integrity of airborne users,especially when they turn near the airport.
文摘本文介绍了GBAS和其进近服务类型,详细介绍了基于GPS单频实现III类运行的GAST D GBAS技术概念框架,研究了地面设备完好性监测框架和播发电文以及机载设备新增算法和监测器设计.针对电离层异常对GBAS运行的影响,根据电离层梯度异常模型,模拟了故障场景,设计实现了GAST D地面和机载仿真验证平台,并对模拟的故障场景下GAST D GBAS系统进行验证和分析.
