民用飞机RNP AR 0.1系统垂直方向误差分配方法研究

Method of civil aircraft RNP AR 0.1 system error distribution in vertical direction

RNP AR功能主要用于高原/高高原机场,是由多个不同的子系统组成的复杂系统,对各子系统有严苛的误差要求。RNP AR总系统误差指标分配包括飞行技术误差、导航系统误差和航迹定义误差。RNP AR值越小,代表对系统的导航精度要求越高,则其误差指标也就需要越小。在民用飞机设计中,RNP AR系统误差指标的分配和确定非常复杂,需要从系统工程的角度来分析和实现。目前,国内越来越多的高原/高高原机场因为实际地形需要运行RNP AR 0.1,但相关适航文件对垂直方向上系统的误差指标尚未发布明确的规定及要求,未对航空器相关系统/设备提出具体的误差指标要求。为此,文中通过分析计算,提出一种适用于民用飞机RNP AR 0.1系统在垂直方向上的误差指标分配方法,对影响RNP AR垂向精度的相关系统/设备提出具体的误差要求,并基于波音B737⁃800飞机模型进行仿真验证。结果表明,所提方法具备正确性、合理性和工程可实现性,适用于民用飞机RNP AR 0.1系统的设计研发及验证。

RNP AR(required navigation performance authorization required)function is mainly used in plateau/high plateau airports.It is a complex system composed of several different subsystems,and has strict error requirements for each subsystem.The error index allocation of RNP AR total system involves flight technical error,navigation system error and track definition error.The smaller the value of RNP AR is,the higher the requirements for the navigation accuracy of the system become,and the smaller the error index is required.In civil aircraft design,the allocation and determination of error indicators of RNP AR system are very complex,which needs to be analyzed and implemented from the perspective of system engineering.More and more plateau/high plateau airports in China need to operate RNP AR 0.1 because of the actual terrain,but in the relevant airworthiness documents,any clear provisions and requirements on the error indicators of the system in the vertical direction have not been issued,and any specific requirements on the error indicators for aircraft's related systems/equipment have not been put forward.A method of vertical direction error index allocation method applicable to RNP AR 0.1 system of civil aircraft is proposed after analysis and calculation,in which some specific error requirements for the relevant systems/equipment that affect the vertical accuracy of RNP AR are put forward,and the simulation verification for the aircraft model based on Boeing B737⁃800 is conducted.The results show that the proposed method is correct,reasonable and feasible in engineering,and is suitable for the design,development and verification of civil aircraft RNP AR 0.1 system.