卫星导航地基增强系统(Ground Based Augmentation System,GBAS),可以提高卫星导航的精度、完好性、连续性和可用性,使飞机在复杂天气和恶劣环境下依然能够实现安全、高效的进近和着陆,满足民航精密进近和着陆引导等高精度导航需求.目前...卫星导航地基增强系统(Ground Based Augmentation System,GBAS),可以提高卫星导航的精度、完好性、连续性和可用性,使飞机在复杂天气和恶劣环境下依然能够实现安全、高效的进近和着陆,满足民航精密进近和着陆引导等高精度导航需求.目前GBAS一类精密进近(CATⅠ)服务水平已经完成验证和应用,但是其定位精度等服务水平仍不能完全满足民航需求.GBAS二类/三类精密进近(CATⅡ/Ⅲ)具有更好的服务水平,其技术和应用仍在开发验证中.为了提高民航运行效率和安全,急需开展基于CATⅡ/Ⅲ与CATⅢ的飞行校验活动.当前GBAS主要采用基于单频GPS的工作模式,在系统可用性、安全性和自主性方面非常受限,因此需要开发自主可控的兼容北斗的GBAS系统.本文设计了飞行校验方案,使用自主研制的国产GBAS设备,设计了飞行校验方案,在西安咸阳机场完成了CATⅡ/Ⅲ盲降精密进近着陆引导的GBAS飞行校验.试验结果表明:兼容北斗的国产GBAS具备支持CATⅡ/Ⅲ精密进近的能力,并且其性能远超传统仪表着陆系统(instrument landing system,ILS).这一成果的取得为我国航空运输的安全性提供了有力保障.展开更多
One of the problems that many engineering graduates face when looking for their first job is： Do you have experience？ Employers prefer graduates with relevant experience to those without. Why is experience so import...One of the problems that many engineering graduates face when looking for their first job is： Do you have experience？ Employers prefer graduates with relevant experience to those without. Why is experience so important to employers？ Can students accumulate ＂working＂ experience while studying in college？ This paper discusses the use of design projects inside and outside of classrooms to help students gain ＂working＂ experience and skills through hands-on design activities that simulate the actual design activities that occur in the industry. Faculty members from the Mechanical Engineering Technology and Computer Engineering Technology departments were involved in creating multidisciplinary design projects. The design projects give students new insights into what they learn in their coursework and pro.vide students the valuable experiences in analytical skills, concurrent engineering approach, people skills, and management skills needed for the students when looking for employment.展开更多
基金Acknowledgments The work is funded by a grant from the National Science Foundation Advanced Technology Education Division. The award number is NSF ATE No 1003712. The authors greatly appreciate the support from the NSF. In addition, the authors also would like to thank all students who are involved in this project.
文摘One of the problems that many engineering graduates face when looking for their first job is： Do you have experience？ Employers prefer graduates with relevant experience to those without. Why is experience so important to employers？ Can students accumulate ＂working＂ experience while studying in college？ This paper discusses the use of design projects inside and outside of classrooms to help students gain ＂working＂ experience and skills through hands-on design activities that simulate the actual design activities that occur in the industry. Faculty members from the Mechanical Engineering Technology and Computer Engineering Technology departments were involved in creating multidisciplinary design projects. The design projects give students new insights into what they learn in their coursework and pro.vide students the valuable experiences in analytical skills, concurrent engineering approach, people skills, and management skills needed for the students when looking for employment.
