GPS组合系统在飞机进场着陆中的应用

GPS Integrated System Application in Aircraft Approach Landing

本文研究了用全球定位系统/捷联惯导/无线电高度表(GPS/SINS/RA)组合导航系统进行飞机精密进场着陆的可行性。提出了系统的组合方案。建立了组合系统的数学模型,应用组合卡尔曼滤波技术,按18颗导航星的布置方案,应用GPS仿真器,在考虑飞机沿3°倾斜角下滑线进行着陆飞行时,对组合系统进行了计算机仿真。仿真结果表明,当GPS接收机采用P码,或采用C/A码再使用差分和伪卫星技术时,组合导航系统能够达到国际民航组织(ICAO)提出的精密进场着陆时的定位精度要求。

The approach landing is an inportant phase in aircraft flight, the precise approach landing is an important guarantee of the flight safety. At present, the in-strument landing system (ILS) and microwave landing system (MLS) are used,which can meet the landing requirements as specified by ICAO. However, any of these systems must be dependent on high-cost ground equipments.This paper investigates the potential of using GPS/SINS/RA integrated system for aircraft precise landing operation. An integrating scheme has been presented, and the dynamic model is established with the application of Kalman filter technique. The simulation for the integrated system performance has been carried out, using a GPS simulator, considering a glide-slope inclination of 3?for aircraft landing. Simulation results indicate that the GPS/SINS/RA integrated system can satisfy the requirements of positioning accuracy for precision approach landing as specified by ICAO on condition that GPS receiver uses the P code or the C/A code and works in the differential mode aided by pseudo-satellite technology.