scholarly journals Distributed fixed-time attitude coordinated control for multiple spacecraft with actuator saturation

2021 ◽  
Author(s):  
Han Gao ◽  
Yuanqing Xia ◽  
Xiaopu Zhang ◽  
Guangchen Zhang
Keyword(s):  
Actuator Saturation ◽  
Coordinated Control ◽  
Fixed Time ◽  
Multiple Spacecraft

scholarly journals Adaptive Fixed-Time 6-DOF Coordinated Control of Multiple Spacecraft Formation Flying with Input Quantization

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Shiyu Wang ◽  
Ruixia Liu ◽  
Lihua Wen
Keyword(s):  
Formation Flying ◽  
Sliding Mode ◽  
Coordinated Control ◽  
Fixed Time ◽  
Control Force ◽  
Terminal Sliding Mode ◽  
Input Quantization ◽  
Spacecraft Formation ◽  
Spacecraft Formation Flying ◽  
Multiple Spacecraft

This paper investigates the fixed-time coordinated control problem of six-degree-of-freedom (6-DOF) dynamic model for multiple spacecraft formation flying (SFF) with input quantization, where the communication topology is assumed directed. Firstly, a new multispacecraft nonsingular fixed-time terminal sliding mode vector is derived by using neighborhood state information. Secondly, a hysteretic quantizer is utilized to quantify control force and torque. Utilizing such a quantizer not only can reduce the required communication rate but also can eliminate the control chattering phenomenon induced by the logarithmic quantizer. Thirdly, a 6-DOF fixed-time coordinated control strategy with adaptive tuning laws is proposed, such that the practical fixed-time stability of the controlled system is ensured in the presence of both upper bounds of unknown external disturbances. It theoretically proves that the relative tracking errors of attitude and position can converge into the regions in a fixed time. Finally, a numerical example is exploited to show the usefulness of the theoretical results.

Distributed Finite-Time Coordinated Attitude Tracking Control for Multiple Spacecraft with Actuator Saturation

2020 ◽  
Vol 29 (13) ◽  
pp. 2050212
Author(s):  
Zhi Gao ◽  
Zhihao Zhu ◽  
Yu Guo
Keyword(s):  
Finite Time ◽  
Tracking Control ◽  
Actuator Saturation ◽  
Sliding Mode ◽  
Terminal Sliding Mode ◽  
Mode Function ◽  
Nonsingular Terminal Sliding Mode ◽  
Attitude Tracking ◽  
Multiple Spacecraft ◽  
Attitude Tracking Control

For multi-spacecraft with actuator saturation, inertia uncertainties and external disturbances, a distributed finite-time coordinated attitude tracking control problem for the spacecraft with the communication topology containing fewer information paths is investigated. Aiming at reducing the communication path, a class of distributed finite-time state observers is designed. To speed up the convergence rate of the multiple spacecraft system, a fast nonsingular terminal sliding mode function is proposed. Moreover, an adaptive control term is proposed to suppress the impact of the external state-dependent disturbances and unknown time-varying inertia uncertainties. Further considering the actuator saturation owing to its physical limitations, a saturation function is designed. With the distributed finite-time observers, the fast nonsingular terminal sliding mode function, the adaptive update law and the saturation function, a distributed finite-time coordinated attitude tracking saturation controller is designed. Using the proposed controller, the follower can synchronize with the common leader with time-varying trajectory in finite time. Simulation results demonstrate the effectiveness of the designed controller.

Adaptive integrated guidance and control for impact angle constrained interception with actuator saturation

2019 ◽  
Vol 123 (1267) ◽  
pp. 1437-1453
Author(s):  
X. L. Ai ◽  
Y. C. Shen ◽  
L. L. Wang
Keyword(s):  
Actuator Saturation ◽  
Fixed Time ◽  
Impact Angle ◽  
Guidance And Control ◽  
Inherent Problem ◽  
Saturation Constraint ◽  
Integrated Guidance And Control ◽  
The Stability ◽  
And Control ◽  
Derivatives Of

ABSTRACTThis paper considers the integrated guidance and control (IGC) problem for impact angle constrained interception against manoeuvring targets with actuator saturation constraint. Based on the backstepping technique, an adaptive IGC law is presented to address this problem, where a fixed-time differentiator is proposed to estimate the derivatives of virtual control inputs to avoid the inherent problem of “explosion of complexity” suffered by the typical backstepping. Furthermore, an auxiliary first-order filter is introduced into the IGC law to cope with the actuator saturation constraint. The stability of the closed-loop system is strictly proved. Finally, the superiority of the proposed IGC law is verified by comparison simulations.

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