GPS INS Integration Application in Flight Management System

Flight management system (FMS) is a specialized computer system that automates a wide variety of in-flight tasks, reducing the workload on the flight crew to the point that modern aircraft no longer carry flight engineers or navigators. The primary function of FMS is to perform the in-flight management of the flight plan using various sensors (such as GPS and INS often backed up by radio navigation) to determine the aircraft's position. From the cockpit FMS is normally controlled through a Control Display Unit (CDU) which incorporates a small screen and keyboard or touch screen. This paper investigates the performance of GPS/ INS integration techniques in which the data fusion process is done using Kalman filtering. This will include the importance of sensors calibration as well as the alignment of the strap down inertial navigation system. The limitations of the inertial navigation systems are investigated in order to understand why INS sometimes is integrated with other navigation aids and not just operating in standalone mode. Finally, both the loosely coupled and tightly coupled configurations are analyzed for several types of situations and operational conditions.

Authors:

• Othman Maklouf
• Abdurazag Ghila
• Saleh Gashoot
• Ahmed Abdulla

Keywords:

• GPS
• INS
• Kalman Filter.

References:

[1] Mohander, S.G., Lawrance, R.W., Angus, P.A. Global positioning
system inertial navigation system and integration, JohnWiley & Sons,
2001.
[2] Titterton D.H. and Weston, J.L. (1997): "Strapdown inertial navigation
technology;" Peter Peregrinus Ltd., London, UK, 1997.
[3] El-Sheimy." Inertial techniques and INS/DGPS Integration". ENGO
623- Lecture Notes, the University of Calgary, Department of Geomatics
Engineering, Calgary (2004).
[4] Hoffmann-Wellenhof, B., H. Lichtenegger, and J. Collins "Global
positioning System; Theory and Practice", Springer New York. (2001).
[5] El-Rabbany, A., "Introduction to GPS: the global positioning system".
(Artech House mobile communications series). ┬® 2002 ARTECH
HOUSE, INC. 685 Canton Street Norwood, MA 02062.
[6] B. L. Stevens and F. L. Lewis. Aircraft Control and Simulation. John
Wiley & Sons, Inc., 1992.
[7] Greg Welch, "An Introduction to the Kalman Filter" Gary Bishop
University of North Carolina at Chapel Hill Department of Computer
Science Chapel Hill, NC 27599-3175 (2001).