Analysis of a Sub-GHz-Band Diffraction Propagation Model for Maritime Application

In this paper, a low-power wide-area wireless system is used to obtain an appropriate model for sub-GHz-band radio propagation diffraction loss in a multi-island area to compare with actual measurements. For the radio propagation in the multi-island sea discussed in this paper, the contour of the obstacle is clear because the obstacle island is surrounded by a horizontal sea surface. As a result, the Bullington method, which assumes a virtual peak at the intersection of the two ends of the obstacle, is found to be suitable. The results also show that the multi-island sea area has an advantage in improving the accuracy of modeling because the criteria for determining isolated obstacles are easy to determine.