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Unaugmented GPS-Based Flight Inspection System

机译：基于GPS的非增强型飞行检查系统

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摘要

A unaugmented Global Positioning System (GPS)-based flight inspection system (FIS) that performs airborne inspection of the instrument landing system (ILS) is introduced. This novel system relies on a TV positioning system (TVPS) that measures the horizontal position over the runway threshold and a radar altimeter (RA) to determine a reference point that is able to remove the GPS biases. Because of the near-real-time nature of flight inspection, it is possible to reconstruct an accurate approach trajectory even though the reference point occurs after the completion of the trajectory. The precise relative positioning (PRP) algorithm is applied to achieve the desired results. It includes a first-order fit to the ionospheric error, based on code and carrier measurements, that enables a significant reduction in this error source. This system has an autonomous integrity feature, called FIS-RAIM (receiver autonomous integrity monitoring), that is equipped in this system to protect against GPS satellite failures that may cause significant positioning errors. The FIS-RAIM is specifically designed for a flight inspection problem, and much of its detail is also described. Experimental flight tests strongly suggest that the system architecture and algorithm could meet FIS accuracy requirements for CAT III ILS with better performance than current flight inspection systems in terms of cost and efficiency. The system is not dependent on any GPS augmentation system; therefore the unaugmented GPS-based FIS provides low cost and high efficiency with worldwide availability.
机译：介绍了一种基于增强型全球定位系统（GPS）的飞行检查系统（FIS），该系统可以对仪表着陆系统（ILS）进行空中检查。这种新颖的系统依赖于电视定位系统（TVPS）和雷达高度计（RA），该电视定位系统测量跑道入口上方的水平位置，以确定能够消除GPS偏差的参考点。由于飞行检查具有近乎实时的性质，因此即使参考点在轨迹完成后出现，也可以重建准确的进近轨迹。应用精确相对定位（PRP）算法来获得所需结果。它包括基于电码和载波测量值的电离层误差的一阶拟合，可以显着降低该误差源。该系统具有称为FIS-RAIM（接收机自主完整性监控）的自主完整性功能，该功能可防止出现可能导致重大定位错误的GPS卫星故障。 FIS-RAIM是专门为飞行检查问题而设计的，并且还将详细介绍其详细信息。实验性飞行测试强烈表明，该系统的体系结构和算法可以满足CAT III ILS的FIS精度要求，在成本和效率方面都比目前的飞行检查系统具有更好的性能。该系统不依赖于任何GPS增强系统。因此，经过增强的基于GPS的FIS可以在全球范围内提供低成本和高效率。

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