Networked spacecraft attitude control method based on hybrid forced observer

An attitude control and spacecraft technology, applied in attitude control, control/regulation system, non-electric variable control and other directions, can solve the problems of amplifying attack signals, affecting the estimation accuracy of the observer, and spacecraft control disorder, and reducing transmission, The effect of avoiding network congestion and improving robustness

Active Publication Date: 2021-02-12
NORTHWESTERN POLYTECHNICAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the spacecraft networked control system, the state measured by the sensor is transmitted through the network. When the transmitted state is maliciously attacked by the attacker, it will directly affect the estimation accuracy of the observer. In severe cases, the attack signal will be further amplified, eventually leading to spacecraft control disorder

Method used

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  • Networked spacecraft attitude control method based on hybrid forced observer
  • Networked spacecraft attitude control method based on hybrid forced observer
  • Networked spacecraft attitude control method based on hybrid forced observer

Examples

Experimental program
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Embodiment

[0095] This embodiment example process figure 1 As shown, the attitude control of the networked spacecraft system based on the hybrid forced observer is realized through the following steps:

[0096] Step 1: Construct a networked spacecraft attitude dynamics model with spoofing attacks

[0097] The expression of spacecraft attitude dynamics is:

[0098]

[0099] in,

[0100] M(q(t))=Z -T (q(t))JZ -1 (q(t));τ(t)=Z -T (q(t))u(t); d 0 (t)=Z -T (q(t))d τ (t);

[0101]

[0102]

[0103] is the modified Rodrigue parameter vector, which is used to represent the attitude of the spacecraft;

[0104] is the positive definite symmetric inertia matrix of the spacecraft, is the control torque of the spacecraft, is the external disturbance moment of the spacecraft, S(·) represents a skew symmetric matrix function, for example:

[0105]

[0106] And choose J=diag{4,5,4}(kgm 2 ),

[0107] let x 1 (t)=q(t), Considering the spacecraft attitude information me...

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Abstract

The invention discloses a networked spacecraft attitude control method based on a hybrid forced observer, and belongs to the field of spacecraft attitude control. The method comprises the steps: firstly, starting from a networked spacecraft attitude kinetic equation containing random spoofing attacks, establishing an expansion system of the networked spacecraft attitude kinetic equation; designinga static event triggering mechanism; secondly, designing a hybrid forced observer to observe unknown nonlinear terms and system states in a spacecraft attitude system by using sensing signals containing event triggering and network spoofing attacks; and finally, designing a composite controller based on the output value of the observer, so that adverse effects of network spoofing attacks and disturbance inside and outside a spacecraft networked system on the system are avoided, the robustness of the system is improved, the transmission of the data volume measured by a sensor is reduced, and aguarantee is provided for smooth completion of a space operation task. The method has a good control effect on a spacecraft networked attitude control system considering network spoofing attacks, andcan be widely applied to other networked control systems containing multiple nonlinearity.

Description

technical field [0001] The invention belongs to the field of spacecraft attitude control, in particular to a networked spacecraft attitude control method based on a hybrid forced observer. Background technique [0002] Spacecraft attitude control is an important part of space operations. With the rapid development of international space technology and the increasing demand for aerospace applications, the new generation of spacecraft, including modern satellites, space stations, spacecraft, space probes, etc., needs to have high reliability, reconfigurability and multi-modular characteristics . The networked control system reduces system wiring, facilitates system diagnosis and maintenance, and increases system flexibility. Therefore, integrating the networked control system analysis method into the next-generation spacecraft control system, and multiple spacecraft communicating through a wireless network to form a spacecraft networked control system, and collaboratively ac...

Claims

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Application Information

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IPC IPC(8): G05D1/08
CPCG05D1/0833
Inventor 袁源于洋张博
Owner NORTHWESTERN POLYTECHNICAL UNIV
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