Modeling Research And Monitoring System Construction Of Different Surface Electromagnetic Environment

With the rapid development of science and technology,communication technology has experienced the stage from wired to wireless.The wide application of communication technology means that human society has entered the information age.As the main carrier of wireless communication signals,electromagnetic waves interact with media in different environments to present dynamic and complex features.The sum of all electromagnetic phenomena of electromagnetic waves in a given area is called the electromagnetic environment.The electromagnetic environment in various geographical scenes is as important as the traditional environmental elements such as topography,meteorology and hydrology.At the same time,scholars have done a lot of work on relevant theoretical research and experimental testing of the electromagnetic environment.The development of theory requires experiments to verify,and the development of experiments requires theory to guide.Therefore,this paper adopts a combination of theoretical analysis and experimental testing.First of all,this paper introduces the division of the antenna radiation field.According to the mirror principle,the physical model of the antenna radiated electric field in the half space background is established.Further,several methods for calculating the spatial field strength under the physical model are given,in which the formula calculation method and the antenna pattern method are studied in detail,and the calculation results of the two method are compared.It provides theoretical support for follow-up work.Secondly,since the actual ground is almost uneven,this paper also simulates the electromagnetic environment based on rough terrain.The Monte Carlo method was used to simulate the Gaussian rough surface,and then the Gaussian rough surface was constructed as the Gaussian rough terrain with corresponding statistical parameters.And the electric field distribution of rough terrain with different statistical parameters was obtained by Wireless InSite.On this basis,this paper continues to explore the electromagnetic simulation results of different types of antennas on rough terrain.Furtherly,this paper builds an electromagnetic environment test system to test the vegetation environment in different scenarios.The tested vegetation environment mainly includes grassland scene,bush scene and forest scene.The tested parameters are receiving electric field strength and receiving power.This paper gives a method for theoretically calculating the spatial field strength of the vegetation environment.The method uses the transmission line model to calculate electric field strength through the pattern file of the horn antenna in the test system.The pattern file includes gain information and phase information of the pitch angle ??and the azimuth angle ? in three dimensions,and compares the theoretical calculation result with the measured result.In view of the dynamic characteristics of the electromagnetic environment with random changes in time and frequency band,this paper also uses the knowledge of front-end development to design the space monitoring system.Finally,the paper is summarized,and the research direction and tasks of the next step are determined on the basis of the research work.In summary,this paper analyzes and studies the electromagnetic environment under different surface to some extent,and has a basic understanding and mastery of electromagnetic environment simulation and prediction.Although there are deficiencies,it still participates in the research task of this group.It has given certain theoretical and experimental support and assistance to provide reference for key technologies and methods for future research.