Correlation Analysis Of Electromagnetic Radiation Field Distribution Characteristics

With the development of the information age,the research of electromagnetic environment in different geographical spaces has gradually become a hot research direction.Due to the interaction between the electromagnetic radiation field and the geographical environment,it produces a variety of electromagnetic radiation field distribution characteristics in different geographical spaces.In order to study the distribution characteristics of electromagnetic radiation field of antenna on rugged terrain in the actual geographical environment,this paper takes omni-directional antenna(half-wave dipole)and directional antenna(horn)as examples to analyze and compress their electromagnetic radiation field distribution on different rough rugged terrain.At the same time,the Pearson correlation coefficient is used to study the correlation of the radiation field distribution characteristics of the two antennas on different rough terrain,and the correlation between the radiation field distribution characteristics of the two antennas is analyzed,The detailed research contents are summaried as follows:(1)In view of the influence of undulating terrain on the distribution of electromagnetic radiation field in the actual geographical environment,firstly,different rough surfaces are constructed by Monte Carlo method to construct the corresponding terrain.Secondly,the electromagnetic radiation field distribution of antennas with different heights and positions in different rough terrain is analyzed.Finally,because the electromagnetic radiation field distribution data is too large and presents two-dimensional distribution map at a certain height,the discrete cosine transform is proposed to compress the electromagnetic radiation field distribution data,which effectively reduces the field distribution data on the basis of retaining the main information of the original electromagnetic radiation field distribution.(2)In order to study the distribution characteristics of electromagnetic radiation field of the same kind of antenna on different rough terrain,taking the distribution characteristics of electromagnetic radiation field of omni-directional antenna(half wave dipole)on different rough terrain as an example,the Pearson correlation coefficient between the distribution characteristics of electromagnetic radiation field of omni-directional antenna and smooth plane is calculated,and the correlation between them is analyzed.A large number of results show that the correlation coefficient of the same antenna in different rough surface environment is in the range of 0.73 ? 1.0,which has a high correlation.(3)In order to distinguish the electromagnetic radiation field distribution characteristics of different types of antennas.Taking the electromagnetic radiation field distribution characteristics of directional antenna(horn)on different rough terrain as an example,the Pearson correlation coefficients between the electromagnetic radiation field distribution characteristics of directional antenna(horn)and horn and half wave dipole antenna on smooth plane are analyzed.It is found that the correlation coefficients between the two antennas are highly correlated between0.68 ? 1.0 and weakly correlated between 0.01 ? 0.2,And the difference between them is obvious.The results show that the correlation analysis can also effectively distinguish the radiation field distribution of omni-directional antenna and directional antenna.In conclusion,the DCT method proposed in this paper can effectively reduce the field distribution data on the basis of retaining the main information of the original electromagnetic radiation field distribution.At the same time,the electromagnetic radiation field distribution characteristics of omni-directional antenna(half wave dipole)and directional antenna(horn)on different rough and undulating terrain are analyzed by using correlation coefficient.It is proved that the distribution characteristics of the same antenna on different rough and undulating terrain have high correlation,which can also effectively distinguish the radiation field distribution characteristics of omni-directional antenna and directional antenna.