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A Hierarchical Control Method for Meridional Offset of Stratospheric Satellites with Model Parameter Uncertainty

A technology of uncertainty and model parameters, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problem of parameter uncertainty, design of stratospheric satellites, etc.

Inactive Publication Date: 2017-09-12
BEIHANG UNIV
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Problems solved by technology

[0005] (2) Technical scheme: the main contents of the present invention are: at first determine the six degrees of freedom dynamics model that realizes stratospheric satellite meridian offset control used, then carry out parameter uncertainty analysis to it, then for overcoming can't use integral feedback The linearization method is difficult to directly design the control law of the stratospheric satellite meridional offset. According to the flight mechanism of the stratospheric satellite, the "ball-rope system", "rope-sail system" and " The three cascaded subsystem models with uncertain parameters, and then decompose the control problem of "rudder control ball" into "rudder control sail", "sail control rope" and "rope control ball" Three sub-control problems, and design the control laws of these three sub-problems

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  • A Hierarchical Control Method for Meridional Offset of Stratospheric Satellites with Model Parameter Uncertainty
  • A Hierarchical Control Method for Meridional Offset of Stratospheric Satellites with Model Parameter Uncertainty
  • A Hierarchical Control Method for Meridional Offset of Stratospheric Satellites with Model Parameter Uncertainty

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Embodiment Construction

[0029] Combine below figure 2 , to further illustrate the design method in the present invention:

[0030] Step 1 proposes the control model.

[0031] figure 1 The establishment of each coordinate system in is based on the following assumptions:

[0032]i) regard the ground coordinate system as an inertial coordinate system;

[0033] ii) The balloon is always in buoyant balance regardless of its rotation;

[0034] iii) The tether is straight and its torsion and aerodynamic effects are ignored;

[0035] iv) The aerodynamic sail always moves in the vertical plane;

[0036] v) Ignore the influence of vertical airflow.

[0037] Such as figure 1 As shown, each coordinate system is defined as follows:

[0038] i) Ground coordinate system O e x e the y e z e :O e is a fixed point on the ground; O e x e Towards due east; O e z e straight down; O e the y e with O e x e , O e z e form a right-handed coordinate system.

[0039] ii) Aerodynamic sail coordinate sys...

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Abstract

A hierarchical control method for meridional offset of stratospheric satellites with model parameter uncertainty, including seven major steps; first, analyze the parameter uncertainty of the six-degree-of-freedom dynamic model to overcome the inability to directly design with the overall feedback linearization method Difficulties in the control law of stratospheric satellite meridional deviation. According to the flight mechanism of stratospheric satellites, the "ball-rope system", "rope-sail system" and "sail-rudder subsystem" are extracted from the above six-degree-of-freedom model The cascaded subsystem model with uncertain parameters is used, and then the control problem is decomposed into three sub-problems, and the control laws of these three sub-problems are designed based on the subsystem model. Select the controller parameters of the three cascaded subsystems, so that the response speed of the "sail-rudder subsystem" is faster than that of the "rope-sail system", and the response speed of the "rope-sail system" is faster than that of the "ball-rope system". System", and finally reliably achieve high-precision control of stratospheric satellite meridional offset under the condition of model parameter uncertainty.

Description

technical field [0001] The invention relates to a hierarchical control method for meridional offset of stratospheric satellites with model parameter uncertainty, by decomposing the system into three cascaded subsystems with parameter uncertainty, and designing self-adaptive systems respectively according to the corresponding subsystems Control law, feedback linearization control law and sliding mode variable structure control law to realize the meridional offset control of stratospheric satellites, provide a more reliable technical solution for the autonomous flight of stratospheric satellites around the earth's latitude, and belong to the field of automatic control technology . Background technique [0002] The adjacent space is the spatial range of 20-100km above sea level, and its bottom (10-50km above sea level) is the stratosphere. The upper and lower convection in the stratosphere is small, and the stable atmospheric circulation is the main one. Near-space vehicles m...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04G05D1/10
Inventor 徐明霍伟
Owner BEIHANG UNIV
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