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AssigneeSaab AB
InventorsPeter Adebjörk, Per-Johan Nordlund, Carl-Olof Carlsson
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A method and an arrangement for synthetically calculating redundant attitude and redundant heading by means of existing data in an aircraft. In one embodiment the heading of the aircraft is available and in another embodiment the heading is calculated from a magnetic heading sensor. When the heading is available (redundant heading) attitude is calculated by weighting together the signals from and angular rate gyros (2) in the aircraft's flight control system, information from air data (altitude, speed, angle of attack) as well as information about heading (redundant heading). When the heading is not available, attitude and heading are calculated in one embodiment with the aid of Kalman filters (11, 22) by weighting together the signals from the angular rate gyros in the aircraft's control system, information from air data (altitude, speed, angle of attack and sideslip angle) as well as information from a magnetic heading detector existing in the aircraft.
Method for synthetically calculating redundant attitude for an aircraft when a heading of the aircraft is known, using data existing in the aircraft, including angular rates p, q, r around x-, y- and z-coordinates of an aircraft-fixed (body frame) coordinate system, air data information including speed, altitude and angle of attack of the aircraft, and the heading information, wherein the method includes the steps:
Arrangement for synthetically calculating redundant attitude for an aircraft when a heading of the aircraft is known, using data existing in the aircraft, including body-frame angular rates (p, q and r) of the aircraft, air data including at least speed, altitude and angle of attack of the aircraft, and the heading information, wherein the arrangement includes an integration routine operable to integrate out the attitude of the aircraft from information about the body-frame angular rates (p, q and r) of the aircraft;
Dependencies are inferred from the claim text.