Joint Localization and Tracking Design for AUV With Asynchronous Clocks and State Disturbances

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Abstract
Localization and tracking are basic services for the applications of autonomous underwater vehicle (AUV). Although they are closely related, the localization or tracking is usually studied independently. This paper addresses a joint localization and tracking issue for AUV, subject to asynchronous clocks in physical channel and state disturbances in control channel. We first develop an asynchronous localization algorithm to estimate the position of AUV, wherein the clocks on AUV and buoys are not required to be synchronized. With the estimated position, a model-free tracking controller is designed for AUV to track the reference trajectory. Particularly, the time-delay estimation and dynamic gain strategies are adopted to reduce the influence of state disturbances. Moreover, the convergence conditions and Cramer-Rao lower bounds (CRLB) for the localization algorithm are derived. For the tracking controller, Lyapunov functions are constructed to analyze the stability, through which the sufficient conditions for asymptotic stability are presented. Finally, simulation and experiment results are given to show the effectiveness of the proposed method. It is demonstrated that the asynchronous localization algorithm in this paper can effectively eliminate the impact of the clock skew and offset. Meanwhile, the tracking accuracy can be significantly improved.
Funding Information
  • National Natural Science Foundation of China (61873345, 61633017, 61603328, 61873228)
  • Youth Talent Support Program of Hebei (BJ2018050)
  • Returned Overseas Chinese Scholar Foundation of Hebei (C201829)
  • Civil-Military Integration Foundation of Hebei (2018B220)

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