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Article

Improved Long Short-Term Memory-Based Fixed-Time Fault-Tolerant Control for Unmanned Marine Vehicles with Signal Quantization

by
Xin Yang
1,
Li-Ying Hao
2,*,
Jia-Bin Wang
2,
Gege Dong
2 and
Tieshan Li
1,3
1
Navigation College, Dalian Maritime University, Dalian 116026, China
2
Marine Electrical Engineering College, Dalian Maritime University, Dalian 116026, China
3
Automation Engineering College, University of Electronic Science and Technology of China, Chengdu 611731, China
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2025, 13(10), 2012; https://doi.org/10.3390/jmse13102012
Submission received: 23 September 2025 / Revised: 12 October 2025 / Accepted: 17 October 2025 / Published: 20 October 2025
(This article belongs to the Special Issue System Optimization and Control of Unmanned Marine Vehicles)
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Abstract

This paper presents a fixed-time fault-tolerant control strategy based on an improved long short-term memory network for dynamic positioning of unmanned marine vehicles subject to signal quantization, disturbances, and input saturation. Firstly, an improved long short-term memory network optimized by an adaptive mixed-gradient algorithm is developed to accurately estimate external disturbances. Secondly, a fixed-time extended state observer is designed to rapidly predict thruster faults. Subsequently, within a fixed-time control framework, a novel terminal sliding-mode surface incorporating signal quantization parameters is constructed. In addition, a dynamic uniform quantization strategy with tunable sensitivity is introduced to effectively alleviate the performance degradation induced by quantization errors. Based on this, a fixed-time fault-tolerant controller is constructed. Finally, simulation results and comparative experiments are provided to demonstrate the effectiveness of the proposed control scheme.
Keywords: fault-tolerant control; dynamic uniform quantization strategy; terminal sliding mode; long short-term memory; fixed-time control fault-tolerant control; dynamic uniform quantization strategy; terminal sliding mode; long short-term memory; fixed-time control

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MDPI and ACS Style

Yang, X.; Hao, L.-Y.; Wang, J.-B.; Dong, G.; Li, T. Improved Long Short-Term Memory-Based Fixed-Time Fault-Tolerant Control for Unmanned Marine Vehicles with Signal Quantization. J. Mar. Sci. Eng. 2025, 13, 2012. https://doi.org/10.3390/jmse13102012

AMA Style

Yang X, Hao L-Y, Wang J-B, Dong G, Li T. Improved Long Short-Term Memory-Based Fixed-Time Fault-Tolerant Control for Unmanned Marine Vehicles with Signal Quantization. Journal of Marine Science and Engineering. 2025; 13(10):2012. https://doi.org/10.3390/jmse13102012

Chicago/Turabian Style

Yang, Xin, Li-Ying Hao, Jia-Bin Wang, Gege Dong, and Tieshan Li. 2025. "Improved Long Short-Term Memory-Based Fixed-Time Fault-Tolerant Control for Unmanned Marine Vehicles with Signal Quantization" Journal of Marine Science and Engineering 13, no. 10: 2012. https://doi.org/10.3390/jmse13102012

APA Style

Yang, X., Hao, L.-Y., Wang, J.-B., Dong, G., & Li, T. (2025). Improved Long Short-Term Memory-Based Fixed-Time Fault-Tolerant Control for Unmanned Marine Vehicles with Signal Quantization. Journal of Marine Science and Engineering, 13(10), 2012. https://doi.org/10.3390/jmse13102012

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