气压垂直导航中修正高度分析

摘要

In the design of Performance-based Navigation (PBN) flight procedure of Sichuan Daocheng Yading airport which is the world's highest civilian airport,since GPS accuracy is low in the vertical direction,the final approach segment uses barometric vertical navigation (Baro-VNAV).However this airport altitude is too high to have a great effect on altitude correction.So this article derives the formula of the ISA temperature deviation's effect on barometric altitude firstly.Thus Derive the formula of correction altitude.The this paper analysethe relationship between airport temperature,the height of leg,airport elevation and altitude correction is analyzed by using matlab tools.Finally the conclusion is verified by Sichuan Daocheng Yading airport's Baro-VNAV.%在世界海拔最高民用机场四川稻城亚丁机场的基于性能导航(PBN)飞行程序设计过程中,由于GPS在垂直方向精度较低,最后进近航段采用气压垂直导航(Baro-VNAV).但机场海拔高,这种导航方式受到修正高度的影响较大.因此通过对ISA偏差对气压高度的影响公式进行推导,得出修正高度公式,利用Matlab对机场温度、航段高、机场标高与修正高度H修的关系进行分析,并以四川稻城亚丁机场Baro-VNAV实例进行了验证.最终给出了在PBN飞行程序设计过程中的建议.