Abstract
Aiming at the application demand in underwater noise monitoring, observation of marine animal, antisubmarine and underwater target localization, a high-SNR underwater acoustic signal acquisition (UASA) node that combines a self-contained acquisition system and floating platform is designed to improve the acquisition performance of a single UASA node, and a high-accuracy synchronization sampling method among multiple distributed UASA nodes based on master-slave dual phase-locked loops (MSDPLL) is proposed to improve the synchronization sampling accuracy. According to the equivalent model of hydrophone and application requirements, low noise signal conditioning circuit and large-capacity data storage modules are designed. Based on the long-term monitoring requirements for underwater acoustic signal and distributed positioning requirements for underwater targets, the structure of a single UASA node is designed and MSDPLL is developed for high-accuracy synchronization sampling among multiple UASA nodes. Related experimental results verified the performance of the UASA node and the synchronization sampling method.
Highlights
As one of the most important underwater information acquisition means, the underwater acoustic signal acquisition (UASA) node plays an important role in underwater acoustic communication, marine noise monitoring, observation of marine animals, antisubmarine, underwater target localization, etc. [1,2,3,4,5,6,7]
The surface equipment floats on the water, which consists of a satellite receiver, main phase lock loop (MPLL), hard disk drive (HDD) and solar cell
The synchronization sampling method based on the master-slave dual phase-locked loops (MSDPLL) improves the synchronization sampling accuracy between multiple distributed UASA nodes, and the synchronization sampling accuracy is 115.04 ns
Summary
As one of the most important underwater information acquisition means, the UASA node plays an important role in underwater acoustic communication, marine noise monitoring, observation of marine animals, antisubmarine, underwater target localization, etc. [1,2,3,4,5,6,7]. Among multiple distributed UASA nodes, several solutions [21,22,23,24,25,26,27,28] have been proposed to achieve high accuracy synchronization sampling [21]. In this paper, aiming at the application demand of underwater acquisition and synchronization sampling between distributed UASA nodes, a high-SNR UASA node that combines the self-contained acquisition system and floating platform is designed to improve the acquisition performance of a single. Its acquisition performance and synchronization accuracy of the synchronization sampling method among multiple distributed UASA nodes are presented based on the experimental measurements
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