The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, the wide-angle two-way parabolic Equation (PE) method is presented and applied for predicting both forward and backward electromagnetic waves propagation in urban environments. The buildings are assumed to be knife-edges or rectangular blocks with vertical sides and flat rooftops, and the terrain is assumed to be flat. The wide-angle Fourier split-step algorithm is iteratively implemented...
The time domain (TD) solution for multiple wedge diffraction case considering plane wave incidence is investigated. The proposed TD solution is based on the representation of the inverse Laplace transform of the corresponding frequency domain (FD) solution in closed form, as it is given by a hybrid of the uniform theory of diffraction (UTD)-physic optics (PO) solution. An algorithm to predict the...
A new high-order accurate method (CS-FDTD) for solving Maxwell equations in the time domain is proposed, in which the time differential is discretized by symplectic scheme and the spatial differential is computed with compact central difference approximation. The CS-FDTD method retains much of the original simplicity of the Yee scheme. Theoretical analysis of numerical stability and dispersion is...
Localization has been extensively researched and applied; in this paper, localization of transmitter in forest environments using inverse diffraction parabolic equation is presented and a good localization estimate is shown.
Electromagnetic wave propagation over sea surface is affected by the surface roughness. In this paper, an improved impedance boundary method is presented and the initial field is calculated by Green function, which improves the stability and accurateness of the parabolic equation (PE). Eventually the forecast of propagation over rough sea surface has been presented with parabolic equation (PE). The...
Analysis of the wave propagation over forest edge with Fourier split-step parabolic equation is presented. The terrain is approximated by piecewise linear segments to simplify implementation of boundary condition. The predicted propagation over forest edge in fir forest environment is compared with measurements, good agreement is reported and the rms error is analyzed.
The combined moment method (MoM)-physical optics (PO) approach proposed by Bilow fails in some cases. Based on the theory of diffraction and the fundamental theory of electromagnetism, Bilow’s diffracted current basis function was modified both within and outside the transition regions. The improved MoM-PO technique is validated by comparison with exact solutions for a right-angled perfectly conducting...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.