High-precision control method for three-axis inertially stabilized platform based on internal model principle and self-adaptive time-varying bandwidth observer

Abstract

A high-precision control method for a three-axis inertially stabilized platform based on an internal model principle and a self-adaptive time-varying bandwidth observer relates to the design of a composite controller of the internal model principle and the self-adaptive time-varying bandwidth observer. The method comprises the following steps: firstly, designing a servo compensator and a stability compensator according to a common instability model of reference input and disturbance signals of the triaxial inertially stabilized platform, and realizing suppression of constant values with known structural characteristics and frequencies and harmonic interference, so as to achieve zero-static-error control; and secondly, according to the state equation of the three-axis inertially stabilized platform, constructing the self-adaptive time-varying bandwidth observer, estimating residual structural characteristics, interference with unknown frequency and random interference in real time, and realizing high-precision control of the three-axis inertially stabilized platform in a complex environment while ensuring rapidity and small overshoot. The method has the advantages of being good in real-time performance, fast in dynamic parameter response, high in multi-source interference adaptability and the like, and can be used for high-precision control and the like of the three-axis inertially stabilized platform in the complex multi-source interference environment.

Description

technical field [0001] The invention relates to a high-precision control method of a three-axis inertial stable platform based on an internal model principle and an adaptive time-varying bandwidth observer, which is suitable for the field of high-precision control of aeronautical surveying and mapping stable platforms. Background technique [0002] The three-axis pod platform is fixed to the flight carrier through the base, supports and stabilizes the remote sensing load, and isolates the influence of the non-ideal attitude motion of the flight carrier on the boresight of the remote sensing load to improve the imaging quality of the remote sensing load, which has a wide application prospect. [0003] As a complex multi-frame coupling system, the three-axis inertial stabilization platform has the characteristics of nonlinearity, strong coupling, and high control difficulty. In addition, the three-axis inertial stabilized platform has wind disturbance during flight, the angula...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the invention is: aiming at the problem that the control performance of the three-axis inertial stable platform is easily affected by external interference when performing tasks, a high-speed three-axis inertial stable platform based on the internal model principle and an adaptive time-varying bandwidth observer is proposed. The precision control method, through the servo compensator and stable compensator based on the internal model principle, realizes the constant value and harmonic interference suppression of the structural characteristics and frequency of the three-axis inertial stable platform during the working process, and then achieves no static error control, Build an adaptive time-varying bandwidth observer to estimate residual structural characteristics and unknown frequency disturbances in real time, as well as random disturbances, to achieve high-precision control of three-axis inertial stable platforms

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