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Abstract
Electromagnetic spectrum distribution prediction is the basis for the development of wireless communication technology. Due to the high randomness of the rough sea surface, it is difficult to accurately predict the offshore electromagnetic spectrum distribution. We present a prediction model of offshore electromagnetic spectrum distribution based on ray tracing method and Pierson-Moskowitz (PM) wave spectrum model. Based on the antenna attitude and the antenna directional pattern, the field strength calculation formulas of the electromagnetic wave sight line ray (SLR) propagation and the electromagnetic wave reflecting line ray (RLR) propagation off the sea surface are established. As the sea surface and the antenna attitude change, the effective rays from the transmitting antenna to the receiving antenna also change. This paper focus on the electromagnetic spectrum distribution prediction by calculating the effective angle (EA) of the transmitting antenna. We relate the EA to the antenna tilt angle and the antenna directional pattern, and combine the PM wave spectrum to establish the offshore electromagnetic spectrum distribution prediction models. Finally, we simulated the electromagnetic spectrum distribution prediction based on specific PM wave spectrum data.
Highlights
In the 21st century, the ocean is being a large scale developed and used
Based on the ray tracing method, we focus on the dynamic offshore electromagnetic spectrum distribution prediction method in this paper
By calculating the φEDA and the φERA, the antenna direction angle corresponding to the effective ray is obtained
Summary
In the 21st century, the ocean is being a large scale developed and used. In order to improve the ability of marine resources development and accelerate the cultivation of emerging marine industries, it is necessary to develop marine science and technology, and promote the construction of ‘‘Wisdom Ocean’’. Based on the environmental data of PM wave spectrum and antenna attitude, a prediction model of offshore electromagnetic spectrum distribution based on ray tracing method is established. According to the relationship between the ray plane and the receiving sphere, the three-dimensional offshore electromagnetic spectrum estimation method in the rough sea environment is studied. The PM wave spectrum is used as the reflecting plane, and the ray tracing method is combined to improve the electromagnetic distribution estimation accuracy. The distribution of the reflecting plane with the PM wave spectrum directly affects the number of rays reaching the receiving antenna Among them, parameters such as antenna pattern, antenna tilt angle and distance are crucial
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