Hierarchical control method for warp offset of stratospheric satellite 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 problems such as designing stratospheric satellites and parameter uncertainty

Inactive Publication Date: 2015-05-20
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 ...

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  • Hierarchical control method for warp offset of stratospheric satellite with model parameter uncertainty
  • Hierarchical control method for warp offset of stratospheric satellite with model parameter uncertainty
  • Hierarchical control method for warp offset of stratospheric satellite 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

The invention discloses a hierarchical control method for warp offset of a stratospheric satellite with model parameter uncertainty. The hierarchical control method comprises seven steps: firstly, performing parameter uncertainty analysis on a six-degree-of-freedom dynamical model, overcoming the difficult point that a warp offset control law of the stratospheric satellite cannot be directly designed by an integral feedback linearization method, extracting cascade subsystem models containing uncertain parameters in a ball-rope subsystem, a rope-sail subsystem and a sail-rudder subsystem from the six-degree-of-freedom dynamical model; decomposing the control problem into three sub problems, and respectively designing control laws of the three sub problems based on the subsystem models; respectively selecting parameters of three cascade subsystem controllers, enabling the response speed of the sail-rudder subsystem to be greater than that of the rope-sail subsystem, and enabling the response speed of the rope-sail subsystem to be greater than that of the ball-rope subsystem; finally, reliably realizing high-precision control over the warp offset of the stratospheric satellite under the condition that the model parameters are uncertain.

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...

Claims

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Application Information

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IPC IPC(8): G05B13/04G05D1/10
Inventor 徐明霍伟
Owner BEIHANG UNIV
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