Offshore Electromagnetic Spectrum Distribution Prediction Algorithm Based on Ray Tracing Method

The detection and management of electromagnetic spectrum resources is becoming more and more important. It is difficult to predict the electromagnetic spectrum distribution accurately in complex maritime environment. In this letter, the offshore environment model is described in conjunction with the Pierson & x2013;Moskowitz (PM) wave spectrum and antenna attitude. Then, we establish the offshore electromagnetic spectrum distribution prediction model. The offshore electromagnetic wave propagation is divided into the sight straight-line ray propagation and rough sea surface reflecting-line ray propagation. Combined with the antenna directional pattern, we propose the effective angle to accelerate effective rays distribution estimation. In the simulation, the ray distribution is obtained based on the instantaneous PM wave spectrum data, and the final field strength of the effective ray at the receiving point is calculated. The experimental results show that the prediction model based on ray tracing method can accurately estimate the offshore electromagnetic spectrum distribution.