Communication Channel Propagation Model Based on a Combination of GTD and SBR.
Abstract
During Phase I significant extensions and improvements to our SBR/GTD propagation model have been made. An extended two-dimensional (2D) model has been developed that can be used in many situations to provide accurate results with less computer time than the fully 3D model. These include situations such as where the transmitting/receiving antennas are low, but there is propagation over buildings or hilly terrain. The computation time for all models (20, extended 2D, and 3D) has been considerably reduced using several acceleration techniques. These include a faster path construction algorithm and improvements in the procedure for reusing diffracted path data. Considerable effort has been expended in providing fast and accurate predictions for rough terrain environments. Thus the SBR/GTD model can be used in situations where both building reflection/diffraction and terrain interactions with the electromagnetic fields are important. Another significant accomplishment was the validation of the SBR/GTD model by comparison with full wave results calculated using the Finite Difference Time Domain (FDTD) method. In addition to validation, the FDTD results can be used to improve the accuracy of the GTD diffraction coefficients and therefore of the SBR/GTD propagation predictions. Validation of the SBR/GTD model was also performed for several new cities, with excellent agreement between the SBR/GTD model results and measurements reported in the literature. Our Phase II proposal was written and submitted.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1998
- Accession Number
- ADA358680
Entities
People
- Jojospeh Schuster
- Raymond Luebbers