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In this article, the uniform theory of diffraction (UTD) is applied to the problem of predicting propagation loss in the frequency range of UHF-VHF using a numerical terrain model. A ray optical model with automatic ray-tracing algorithm for a two-dimensional piecewise-linear terrain profile and field computation method are presented in this contribution. The predicted results are compared with measured data and with the results of other propagation prediction models. [ABSTRACT FROM AUTHOR]

The exponential time differencing (ETD) schemes are proposed for transient propagation in dynamic collision plasmas using finite-difference time-domain method. The formulation of ETD algorithms with the first order and second accuracy is presented. The ETD algorithms are validated by comparing the simulation results with analytical values. The numerical results indicate that the ETD schemes are accurate and efficient. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1363–1364, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22424 [ABSTRACT FROM AUTHOR]