Study on Diffraction Loss Model of Land-based Marine Communication Ship
The huge number and throughput of ships in major maritime ports and waterways leads to frequent blockage of land-based ship communication links by passing ships.This significantly impacts the connection quality of land-based ship communication links.By analyzing the large-scale channel characteristics resulting from the shadow effect caused by passing large ships in the ship-shore communication channel measurement scene,we have developed a precise model based on measured data.The analysis incorporates factors such as the first Fresnel radius,offshore distance,receiver antenna path distance,antenna connection height,and relative height change due to sea surface curvature.It also classifies different time nodes corresponding to the relative position of shielded ships in the first Fresnel region.Furthermore,a ship diffraction loss model is constructed based on three-dimensional occluding ship data and relative positions of receiving and originating ends using single blade diffraction model and single circular row diffraction model recommended in ITU-R P.526-15(10/2019).Model simulation and comparison analyses for two ship occlusion processes within D06 range(the distance of 0.6 times the First Fresnel Zone clearance)and outside this range are conducted,with proposed future application directions based on these results.
land-based ship communicationship-shore communication channeldiffraction loss modelFirst Fresnel Zone
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