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Synthetic Attitude and Heading Reference for Saab Gripen
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
Saab AB, Sweden.
Saab AB, Sweden.
2000 (English)In: Proceedings of the 39th IEEE Conference on Decision and Control, IEEE , 2000, Vol. 3, 2040-2043 p.Conference paper (Refereed)
Abstract [en]

In future versions of Saab Gripen, the mechanical artifical horizon will be replaced by a computer calculated attitude and heading, independent of the inertial navigation system (INS). The system uses data from sensors already existing in the aircraft, which are easily available in a highly integrated, 4th generation combat aircraft such as the Gripen. The sensors used are a three-axis magnetic detector, true airspeed, angle of attack, barometric altitude, flight control rate gyros and load factor. The sensor data are fused together in an extended Kalman filter (EKF). Each sensor by itself is of relatively poor quality. For instance, the accuracy of the rate gyros is in the order of degrees per second, rather than degrees per hour as is the case in gyros dedicated for navigational use. However, when all data are combined, they provide an attitude and heading estimate with sufficient quality for its purpose; to cross-monitor the INS, and to serve as a backup in case of an INS or data bus failure. The system is called synthetic attitude and heading reference system (SAHRS), and is a Saab patent. A similar system is developed for and is operational in the Saab Viggen.

Place, publisher, year, edition, pages
IEEE , 2000. Vol. 3, 2040-2043 p.
Keyword [en]
Kalman filters, Aerospace computing, Aircraft control, Filtering theory, Sensor fusion
National Category
Engineering and Technology Control Engineering
URN: urn:nbn:se:liu:diva-90779DOI: 10.1109/CDC.2000.914092ISBN: 0-7803-6638-7OAI: diva2:616479
39th IEEE Conference on Decision and Control, Sydney, Australia, 12-15 December 2000
Available from: 2013-04-17 Created: 2013-04-07 Last updated: 2015-03-23

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Nordlund, Per-Johan
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Automatic ControlThe Institute of Technology
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