Abstract
A distributed single-input multiple-output (SIMO) sonar system is composed of a sound source and multiple underwater receivers. It provides an important framework for underwater target localization. However, underwater hostile environments bring more challenges for underwater target localization than terrestrial target localization, such as the difficulties of synchronizing all the underwater receiver clocks, the varying underwater sound speed and the uncertainties of the locations of the underwater receivers. In this paper, we take the sound speed variation, the time synchronization and the uncertainties of the receiver locations into account, and propose the underwater target localization and synchronization (UTLS) algorithm for the distributed SIMO sonar system. In the distributed SIMO sonar system, the receivers are organized in a star topology, where the information fusion is carried out in the central receiver (CR). All the receivers are not synchronized and their positions are known with uncertainties. Moreover, the underwater sound speed is approximately modeled by a depth-dependent sound speed profile (SSP). We evaluate our proposed UTLS algorithm by comparing it with several benchmark algorithms via numerical simulations. The simulation results reveal the superiority of our proposed UTLS algorithm.
Highlights
As a fundamental function for sonar systems, target localization based on multistatic sonar has gained significant attention
We focus on the underwater target localization based on the single-input multiple-output (SIMO) sonar system which consists of a sound source and multiple receivers organized in a star topology
We considered the problem of underwater target localization and synchronization for the distributed SIMO sonar system
Summary
As a fundamental function for sonar systems, target localization based on multistatic sonar has gained significant attention. We focus on the underwater target localization based on the SIMO sonar system which consists of a sound source and multiple receivers organized in a star topology. It is necessary to perform target localization considering the variation of underwater sound speed, the uncertainties of the receiver locations and the time synchronization. The authors of [36] consider the problem of locating multiple disjoint sources using TDOAs and frequency differences of arrival (FDMA) in the presence of anchor position and velocity errors, and propose an asymptotically efficient estimator. With the consideration of the USR curve, the time synchronization and the uncertainties of the receivers, we propose the underwater target localization and synchronization (UTLS) algorithm for the distributed SIMO sonar system.
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