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Static output feedback pi beam stabilization control method for high-orbit satellite satellite-ground laser link
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A static output feedback, satellite-to-ground laser technology, applied to controllers with specific characteristics, electric controllers, etc., can solve the problems of complex parameter selection of PI controllers, and achieve the effect of shortening the design and simple control algorithm
Active Publication Date: 2018-10-09
HARBIN INST OF TECH
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[0004] The purpose of the present invention is to solve the problem of complex parameter selection of the PI controller in the tracking system of the existing communication laser beam, and to provide a static output feedback PI beam stabilization control method for the high-orbit satellite satellite-ground laser link
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specific Embodiment approach 1
[0049] Specific implementation mode one: the following combination figure 1 Describe the present embodiment, the static output feedback PI light beam stabilization control method of the high-orbit satellite satellite-ground laser link described in the present embodiment, it comprises the following steps:
[0050] First, the dynamic equation of the satellite optical communication system is obtained by the parameter identification method as follows:
[0051]
[0052] In the formula, A, B, and C are system parameters, x(t) is the state vector of the system; u(t) is the control input variable of the system, and y(t) is the output variable of the system;
[0053] The dynamic equation of the PI controller is:
[0054]
[0055] where K p and K i is the parameter to be determined to stabilize the PI controller; τ is the integral variable;
[0056] The construction variable s(t) is:
[0057]
[0058] Construct state variable for:
[0059]
[0060] The dynamic equati...
specific Embodiment
[0092] 1) The transfer function of the satellite optical communication fine pointing system is obtained by the method of parameter identification:
[0093]
[0094] Where T=0.022, the above frequency domain model is transformed into the following state space form
[0095]
[0096] 2) Transform the stabilizing PI control system into a stabilizing static output feedback control system;
[0097] 3) obtain the stable static output feedback controller by the method provided by the invention;
[0098] K=[0.9807-0.0284];
[0099] 4) Construct a stabilized PI controller by the parameters of the output feedback controller:
[0100] K p =0.9807,K i =-0.0284.
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Abstract
The invention provides a stable control method of satellite-earth laser link static output feedback PI (proportional integral) light beams of a high-orbit satellite, belongs to the technical field of communication laser beam tracking and aims to solve the problem of complicated parameter selection of a PI controller of an existing communication laser beam tracking system. The stable control method comprises steps as follows: a dynamic equation of a satellite optical communication system and a dynamic equation of the PI controller are acquired with a parameter identification method, a stabilizing PI control system is converted into a stabilizing static output feedback control system, a stabilizing static output feedback controller is acquired, and a stabilizing PI controller is constructed according to parameters of an output feedback controller. Through precision adjustment of static output feedback parameters of the PI controller, the problem about stable tracking of the satellite-earth laser link light beams of the high-orbit satellite is solved. The stable control method is applied to stable tracking of the communication laser beams.
Description
technical field [0001] The invention relates to a static output feedback PI light beam stabilization control method for a satellite-ground laser link of a high-orbit satellite, and belongs to the technical field of communication laser beam tracking. Background technique [0002] Satellite optical communication terminals use laser beams as signal carriers to transmit information between two relatively moving satellites. Considering the long communication distance of laser communication (thousands to tens of thousands of kilometers), the limited signal transmission power, the limited sensitivity of the receiving sensor, and the limited aperture size of the receiving antenna, it is required to minimize the beam spread angle of the communication beam, so it is necessary to The laser communication terminal has a stable tracking ability for the communication beam. [0003] The fine tracking system consists of a fast tilting mirror driven by piezoelectric ceramics and a fine track...
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