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Photoelectric tracking system control method based on improved Smith estimator

A technology of photoelectric tracking system and control method, applied in adaptive control, general control system, control/regulation system, etc., can solve the problem of insufficient performance of inertial stabilization platform disturbance suppression, reduce nonlinear suppression capability of control system, speed loop delay, etc. It can improve the disturbance suppression ability, simple structure and good effect.

Inactive Publication Date: 2019-01-08
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

In actual use, in order to reduce the noise of FOG and ensure the measurement accuracy in engineering, it is necessary to filter the output signal of FOG, which brings a significant delay to the speed loop
Latency can limit the bandwidth of the speed loop and reduce the nonlinear rejection ability of the control system
In addition, although velocity feedback control is a high-precision robust control method, the disturbance suppression performance of inertial stabilized platforms is still insufficient when subjected to uncertain disturbances

Method used

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  • Photoelectric tracking system control method based on improved Smith estimator
  • Photoelectric tracking system control method based on improved Smith estimator
  • Photoelectric tracking system control method based on improved Smith estimator

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Embodiment Construction

[0028] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] Such as figure 1 Shown is the single-loop feedback structure block diagram of the photoelectric tracking system, which includes A / D, controller, D / A, controlled object and sensor. In order to ensure the stability of the system, it is necessary to design a corresponding compensation loop for the sensor delay link in the system. At the same time, in order to solve the problem of insufficient disturbance suppression ability of the system, it is necessary to add a disturbance compensation strategy at the same time. Therefore, the analysis of the delay and disturbance problems in the system is the theoretical basis for solving the problem, and the corresponding compensation control loop is designed according to the theoretical analysis. The specific implementation steps are as follows:

[0030] Step (1): The delay links in t...

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Abstract

The invention provides a photoelectric tracking system control method based on an improved Smith estimator. For the problems of delay and insufficient anti-interference capability existing in a current photoelectric tracking system, the influence of the delay on the system stability is reduced by using a Smith time lag compensation principle, and meanwhile, the control structure of a classic Smithestimator is improved, so that a control structure capable of shortening the time delay and effectively improving the disturbance suppression capability of the system is realized. The core is that the influence caused by the delay and the disturbance amount are estimated by using an error feed-forward thought and are fed forward into a forward channel of a control loop, so that the delay compensation and the disturbance compensation are realized. According to the method, the adverse influence of the delay on the system is eliminated and the disturbance suppression capability of the system isfurther improved, so that the stability of the system is higher.

Description

technical field [0001] The invention belongs to the field of system control, and in particular relates to a photoelectric tracking system control method based on an improved Smith predictor, which is mainly used for compensating sensor delay in a stable speed loop of a control system and eliminating the influence of external disturbances on system stability. Background technique [0002] The photoelectric tracking system receives the optical radiation of the selected moving target and generates a control signal to track the target. It is widely used in target tracking, aerospace and astronomical observation and other fields. The closed-loop performance of an optoelectronic tracking system is severely limited by the low sampling rate and mechanical resonance of the detector. Its closed-loop performance evaluation depends on the closed-loop bandwidth and interference suppression performance. In the past, researchers improved the nonlinear characteristics of the controlled obj...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 任维赵志强周翕李志俊毛耀张超
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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