VDE-SAT downlink channel modeling method

doi:10.7523/j.ucas.2022.062

Abstract

Abstract: The scattering characteristics of sea surface lead to the complex and changeable channel model of VDES maritime communication. In the VDE-SAT downlink, low elevation communication leads to more serious multipath effect caused by wave reflection. To solve this problem, a VDE-SAT downlink channel modeling method based on spherical coordinate system was proposed to analyze the influence of wave reflection on signal receiving characteristics according to different sea conditions. Firstly, the statistical results of sea surface scattering characteristics are parameterized and combined with the influence of earth curvature, a geometric model of satellite-ship communication based on spherical coordinate system is established. Based on this, the effective diffuse reflection area of sea surface is obtained. Secondly, the signal multipath propagation model of Satellite-Ship communication link is established. Based on G1139 protocol, the power distribution of received signals is analyzed according to the channel parameters of each path, as well as the receiving characteristics of signals at different sea levels. The simulation results show that the multipath channel is mainly specular reflection in good sea state and diffuse reflection in bad sea state. Compared with convolutional codes, Turbo codes have better anti-multipath performance.

Key words: VDE-SAT, channel model, satellite communication, multipath effect

CLC Number:

TN927

DING Ganghui, LI Zongwang, XIE Zhuochen, LIANG Xuwen. VDE-SAT downlink channel modeling method[J]. Journal of University of Chinese Academy of Sciences, 2024, 41(2): 249-256.

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