Aircraft fast anti-interference longitudinal guidance method based on specified performance

Abstract

The invention relates to an aircraft fast anti-interference longitudinal guidance method based on specified performance. The aircraft fast anti-interference longitudinal guidance method based on specified performance includes the steps: establishing a longitudinal aircraft dynamical model with pneumatic parameter uncertainty, wherein the pneumatic parameters include a lift coefficient and a resistance coefficient; performing specified performance conversion through the designed specified performance function and conversion function to obtain a model after conversion; performing fast estimationon pneumatic parameter uncertainty of the aircraft by designing a sliding mode interference observer to obtain an interference estimate value; designing a sliding mode control law to complete the fast control task demand; and designing a composite sliding mode controller to complete the aircraft fast anti-interference longitudinal guidance method based on specified performance. The aircraft fastanti-interference longitudinal guidance method based on specified performance can specify three performances of the control system: the convergence rate, the overshoot and the steady state error, hasthe characteristics of rapidity and high precision, is suitable for fast anti-interference guidance system based on specified performance for various types of flight systems and other high altitude unmanned aerial vehicles, and can also solve the problem of aircraft faults such as fast fault tolerance.

Description

technical field [0001] The invention relates to an aircraft fast anti-jamming longitudinal guidance method based on specified performance, which solves the problem of fast and high-precision anti-jamming guidance of the aircraft with uncertain aerodynamic parameters. Background technique [0002] UAVs, hypersonic vehicles, missiles and other aircraft are important weapons in the military field, and play a pivotal role in high-altitude pursuit, unmanned reconnaissance, global strikes and other fields. Such aircraft have the advantages of speed, high maneuverability, and accuracy. , Widely used in military, civilian and other fields. During the mission of the aircraft, the terminal re-entry guidance is particularly important, and it is one of the key technologies of the mission, which needs to meet the requirements of speed and accuracy. For example, weapons such as missiles, if they cannot meet certain rapidity indicators, are easily intercepted and destroyed by the intercep...

AI Technical Summary

Problems solved by technology

The above patents and articles all use the sliding mode control method to enable the system to converge within a limited time, but the anti-interference problem in complex environments is not considered. In response to this problem, the following research improves the aircraft altitude sliding mode control system

Patent Application No. 201610306205.1 proposes an anti-jamming composite online guidance method for the Mars lander's atmospheric entry section, but the observer used in this method does not have the ability to converge in a limited time and cannot meet the needs of rapid guidance

The article "Sliding Mode Control of Hypersonic Aircraft Terminal Based on Disturbance Observer" designs a nonlinear disturbance observer based on sliding mode control to enhance the robustness of the controller, and adaptively estimates model uncertainties and compensation, but the anti-disturbance sliding mode control method cannot perform specified performance control on the height

[0004] In summary, the existing methods lack fast and high-precision control capabilities with specified performance when the aerodynamic parameters are uncertain, and it is urgent to overcome the rapid anti-jamming longitudinal guidance method for aircraft based on specified performance.

Images