Abstract
Abstract — Researchers have always been in favor of path loss calculation in different media for applications such as telecommunication link design. Wave propagation calculations in large spaces using the FDTD method is time-consuming and imposes a great computational burden. For this reason, to replace the classical FDTD method for wave propagation simulation and path loss calculation in large spaces, optimized methods, namely TDWP, have been provided. In this paper, the use of the TDWP method for wave propagation simulation and path loss calculation above a terrain is investigated. Longitudinal components of ground-waves are taken into account (including direct waves, ground reflections, and surface waves). Propagation space is longitudinally divided into smaller FDTD windows with finite length. The electromagnetic pulse travels through these windows from left to right to the desired point. But despite its capability in reducing computational burden and increasing processing speed, TDWP has lower precision in instantaneous field simulation and calculation of propagation coefficients, so that results obtained from FDTD and TDWP are clearly different. In this paper, some efficient methods are proposed, which yield an increase in method accuracy.
Highlights
Modern communication and radar systems need effective tools to foresee propagation
In (1), antenna gains are measured with respect to an isotropic reference antenna, and represents all system losses, including thermal loss, signal loss in cables, mismatch loss, etc
This equation is used in cellular communication system design to foresee each antenna coverage and dead zones before they are installed
Summary
Modern communication and radar systems need effective tools to foresee propagation. In many cellular communication and HF and VHF radar sites, high precision propagation simulation is vital. In (1), antenna gains are measured with respect to an isotropic reference antenna, and represents all system losses, including thermal loss, signal loss in cables, mismatch loss, etc This equation is used in cellular communication system design to foresee each antenna coverage and dead zones before they are installed. Several numerical methods have been introduced for the analysis of electromagnetic problems Most of these methods are based on full-wave analysis in the time or frequency domain; and utilize one or two difference equations, plus boundary conditions (depending on the specific case) to solve the problem [7 – 10]. These methods are powerful and can be used to solve a wide variety of problems, due to improper usage and intrinsic limitations, sometimes the derived answer is erroneous Unless errors such as overflow or underflow have occurred, computers always produce answers. The simulation process is modified to reduce these differences
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