Unaugmented GPS-Based Flight Inspection System

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.

[1]  P. B. Ober,et al.  On the use of Multiconstellation-RAIM for Aircraft Approaches , 2006 .

[2]  Paul W. McBurney,et al.  Self-Contained GPS Integrity Check Using Maximum SOLUTION SEPARATION AS THE TEST STATISTIC , 1987 .

[3]  Euiho Kim,et al.  WAAS-Based Flight Inspection System , 2007 .

[4]  R. Grover Brown,et al.  A Baseline GPS RAIM Scheme and a Note on the Equivalence of Three RAIM Methods , 1992 .

[5]  C. M. Feit,et al.  Accurate positioning in an inertial-based automatic flight inspection system using differential global navigation satellite systems , 1994, Proceedings of 1994 IEEE Position, Location and Navigation Symposium - PLANS'94.

[6]  W. R. Fried,et al.  Avionics Navigation Systems , 1969 .

[7]  Thia Kirubarajan,et al.  Estimation with Applications to Tracking and Navigation: Theory, Algorithms and Software , 2001 .

[8]  B. M. Scherzinger,et al.  The design, simulation and implementation of an accurate positioning system for automatic flight inspection , 1990, IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences.

[9]  Euiho Kim,et al.  Innovative use of global navigation satellite systems for flight inspection , 2007 .

[10]  Cecelia Feit,et al.  Accurate Positioning in a Flight Inspection System Using Differential Global Navigation Satellite Systems , 1994 .

[11]  Euiho Kim,et al.  A Development of WAAS-Aided Flight Inspection Truth System , 2006, 2006 IEEE/ION Position, Location, And Navigation Symposium.