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2023, Volume 24, Issue 1

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Frontiers of Information Technology & Electronic Engineering >> 2023, Volume 24, Issue 1 doi: 10.1631/FITEE.2100398

Acoustic localization with multi-layer isogradient sound speed profile using TDOA and FDOA

Affiliation(s): College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China; Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province, Ocean College, Zhejiang University, Zhoushan 316021, China; less

Received: 2021-08-22 Accepted: 2023-01-21 Available online: 2023-01-21
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Abstract

In the underwater medium, the speed of sound varies with water depth, temperature, and salinity. The inhomogeneity of water leads to bending of sound rays, making the existing localization algorithms based on straight-line propagation less precise. To realize high-precision node positioning in s (UASNs), a multi-layer isogradient (SSP) model is developed using the linear segmentation approximation approach. Then, the sound ray tracking problem is converted into a polynomial root-searching problem. Based on the derived gradient of the signal's Doppler shift at the sensor node, a novel underwater node localization algorithm is proposed using both the and . Simulations are implemented to illustrate the effectiveness of the proposed algorithm. Compared with the traditional straight-line propagation method, the proposed algorithm can effectively handle the sound ray bending phenomenon. Estimation accuracy with different SSP modeling errors is also investigated. Overall, accurate and reliable node localization can be achieved.

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