基于准载波相位差分技术的地基增强系统机载定位精度性能研究

Research on Airborne Positioning Accuracy Performance of GBAS Based on RTK

地基增强系统(ground-based augmentation systems,GBAS)中机载导航定位精度和精度可靠性关系到飞机和人员的生命财产安全。因此,提出了在GBAS中使用以准载波相位差分技术(real-time kinematic,RTK)为差分方式减小潜在误差影响的方法。RTK利用了参考站和移动站之间观测误差的空间相关性,通过差分的方式消除了移动站观测数据中的大部分误差。与传统的差分方式相比,RTK具有更大的技术优势。通过实验验证和数据仿真结果表明:该方案的单频准RTK可实现分米级甚至厘米的高精度定位,能够为飞机的进近提供精密和稳定的导航数据,同时为机场实现GBAS CAT Ⅱ/Ⅲ类精密进近服务起到积极地促进作用。

Ground based augmentation system（ GBAS） in the navigation positioning accuracy and precision of reliability related to the safety of the aircraft and people life and property. Therefore,the method of using quasi carrier phase difference（ real-time kinematic,RTK） in the GBAS to reduce the potential error is proposed. RTK eliminates the most errors in the observation data of the mobile station by the way of difference,based on the spatial correlation of the observation error between the reference station and the mobile station. And compared with the traditional finite difference method,RTK has more advantages. Results of through experimental verification and data simulation show： The scheme of single frequency quasi RTK can achieve high precision positioning even centimeter decimeter,and able to provide accurate and stable navigation data for aircraft approaching. At the same time for the airport to achieve GBAS CAT class Ⅱ/Ⅲ precision access services play a positive role in promoting.