A Kalman Filter Based Identification Method for Angle of Attack and Angle of Sideslip

Abstract

The invention provides a method for identifying angle of attack and sideslip angle based on Kalman filter, comprising: establishing a recursive model and an observation model of angle of attack α and angle of sideslip β; obtaining a step of angle of attack α and angle of sideslip β Predicted value Xpre; get one-step predicted mean square error Ppre; get measurement matrix H and measurement quantity Z; get filter gain K; get Kalman filtering angle of attack α(k+1) and Kalman filtering side slip angle β( k+1); get the updated error variance matrix P'; get the updated one-step predicted value Xpre' of the attack angle α and sideslip angle β, and return to S4 based on the updated error variance matrix P' and the updated one-step The predicted value Xpre' is used for the next iteration. The present invention establishes the recursive model and the observation model of the angle of attack α and the sideslip angle β, and performs Kalman filtering based on the recursive model and the observation model of the angle of attack α and the sideslip angle β, so that the angle of attack α and the sideslip angle can be realized. High-precision online identification of angle β. The present invention is used under the condition of no measuring device for the angle of attack and the sideslip angle, saves a set of sensing collection equipment, and can realize synchronous measurement of the angle of attack and the sideslip angle.

Description

technical field

[0001] The invention relates to the technical field of measuring the angle of attack and the sideslip angle during the flight of an aircraft, in particular to a method for identifying the angle of attack and the sideslip angle based on a Kalman filter. Background technique

[0002] At present, aircraft such as flying missiles or unmanned aerial vehicles are generally not equipped with sensors for angle of attack and sideslip angle, so there is a lack of means to directly measure angle of attack and sideslip angle. In flight control and engine control, the attack angle and sideslip angle of the aircraft are another important parameter to be controlled.

[0003] At present, control professionals often use overload instead of angle of attack and angle of sideslip. However, there are many factors that affect the overload, in addition to the attack flank angle, there are also factors such as dynamic pressure and flight speed, so the accuracy is poor and the relia...

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