Underwater Image Transmission Method and Realization Based on Inductively Coupled Mooring Chain  

作　　者：ZHENG Yu LIU Yingjie SONG Rujuan LI Hongzhi 

机构地区：[1]School of Life Sciences,Tiangong University,Tianjin 300387,China [2]National Ocean Technology Center,Tianjin 300112,China

出　　处：《Journal of Ocean University of China》2024年第6期1503-1514,共12页中国海洋大学学报（英文版）

基　　金：supported by grants from the National Natural Science Foundation of China(No.62071329);the National Science Foundation of Tianjin(No.23JCZD JC00440)。

摘　　要：Inductively coupled mooring chain transmission technology plays a crucial role in the long-distance online monitoring of marine hydrographic information.However,the impedance characteristics of the seawater medium pose a limitation on its capability to achieve high-speed real-time transmission of underwater images.In this paper,based on the principle of inductively coupled transmission for marine applications,the selected 1920×1080 pixel images are segmented,packaged,and then transmitted to the sending node using the user datagram protocol(UDP),and the modulation and demodulation of the transmitted images are realized using the orthogonal frequency division multiplexing(OFDM)algorithm of least squares(LS)estimation,and eight combinations with different mapping modes and coding rates are tested in the bandwidth of 200-800 k Hz and the quality of the transmitted images is evaluated using three criteria:mean squared error(MSE),peak signal to noise ratio(PSNR),and structural similarity index(SSIM).The results indicate that the image transmission quality is optimal when the mapping method is 16-quadrature amplitude modulation(16QAM),the coding rate is 1/2,and the center frequency is 800 k Hz.Under these conditions,the maximum transmission rate is 0.84 Mbit s^(-1),the SSIM criterion exceeds 0.91690 d B,and the learned perceptual image patch similarity(LPIPS)is less than 0.06000.This paper provides a solution for the underwater image transmission of inductively coupled mooring chains for marine applications.

关 键 词：OCEAN inductively coupled mooring chain underwater image OFDM data communication 

分 类 号：U653.2[交通运输工程—港口、海岸及近海工程] P75[交通运输工程—船舶与海洋工程]