Accession Number : ADA307444

Title :   A Wide Angle Split-Step Parabolic Equation Model for Propagation Predictions Over Terrain.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Vlachos, Konstantinos

PDF Url : ADA307444

Report Date : MAR 1996

Pagination or Media Count : 54

Abstract : The problem of radiowave propagation over irregular terrain is solved by using the wide angle parabolic equation method. The terrain is characterized by its height profile and its ground constants (here conductivity alpha goes to infinity). We consider horizontal polarization and treat the round as perfectly conducting (PEC) to simplify the formulation. This thesis uses a piece-wise conformal transformation to flatten the irregular terrain. The equations are solved by the split-step Fourier algorithm. A Hanning window is used both in spatial and in wavenumber domains to contain the computational domain. Effect of some numerical parameters such as the horizontal step size height of the computational domain on the accuracy of the solution is investigated. The numerical results are compared with available results for some typical propagation problems.

Descriptors :   *MATHEMATICAL MODELS, *ALGORITHMS, *RADIO WAVES, SIGNAL PROCESSING, FOURIER TRANSFORMATION, GROUND LEVEL, POLARIZATION, COMPUTATIONS, PARAMETRIC ANALYSIS, PARAMETERS, ACCURACY, THESES, ELECTROMAGNETIC WAVE PROPAGATION, TERRAIN, MATHEMATICAL PREDICTION, APPROXIMATION(MATHEMATICS), INTERPOLATION, PARTIAL DIFFERENTIAL EQUATIONS, NUMERICAL METHODS AND PROCEDURES, RADAR SIGNALS, ELECTROMAGNETIC WAVE REFLECTIONS, HEIGHT, MAPPING(TRANSFORMATIONS), TRANSMITTER RECEIVERS, ATMOSPHERIC REFRACTION, RADAR TRANSMITTERS, VERY HIGH FREQUENCY, CONFORMAL MAPPING.

Subject Categories : Operations Research
      Radiofrequency Wave Propagation
      Numerical Mathematics

Distribution Statement : APPROVED FOR PUBLIC RELEASE