Small aircraft attack angle sliding mode tracking method based on inverse solution transfer function

Abstract

The invention relates to a small aircraft attack angle sliding mode tracking method based on an inverse solution transfer function, and belongs to the field of rehabilitation robots. The method comprises the following steps: measuring an attack angle of an aircraft, forming an attack angle error signal with an instruction signal, and performing softening and exponential transformation to obtain asoftening and exponential error signal; carrying out integration to obtain a corresponding integration signal; then carrying out filtering differential to obtain an attack angle differential signal, and measuring a pitch angle rate signal to carry out linear combination so as to obtain a sliding mode surface signal; forming an equivalent nominal control item according to nominal model information,and forming a combined control quantity together with nonlinear transformation of a sliding mode surface and the attack angle error signal; and then through a nonlinear inverse solution transfer function method, weakening flutter brought by sliding mode control, generating a pitch channel control law, and realizing attack angle tracking control of the aircraft. The method has advantages of high attack angle tracking precision, a high anti-interference capability, small flutter and a good attack angle tracking dynamic effect.

Description

technical field [0001] The invention relates to the field of flight control and guidance of a small aircraft, in particular to a sliding mode tracking method for an angle of attack of a small aircraft based on an inverse solution transfer letter. Background technique [0002] The flight control of small aircraft has more and more applications in civilian and unmanned fields. Simple control, low economic cost of measuring components, high control precision, fast dynamic response, strong anti-interference ability, and sufficient stability margin. These high-performance indicators have always been the pursuit of excellence in the design of small aircraft systems. However, because the measurement components invested in small aircraft are constrained by the economic cost, it is often impossible to use expensive precision inertial navigation components, so the control accuracy and control effect are often not comparable to manned aircraft or military aircraft. [0003] Based on t...

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of tracking method of small aircraft angle of attack sliding mode based on inverse solution transfer function, and then at least to a certain extent overcome the insufficient anti-jamming capability and poor tracking accuracy of angle of attack due to the limitations and defects of related technologies high problem

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