VHF/UHF path-loss calculations using terrain profiles deduced from a digital topographic data base
Abstract
A digital topograhic data base comprising some 150,000 sq. km of southern Ontario was established to allow terrain profiles profiles to be constructed automtically. The profiles, together with a variety of terrain surface cover information also derived from the data base, are used in the calculation of path loss, signal strength, and signal to noise ratios for various types of VHF/UHF systems. These calculations incorporate a number of additional factors necessary to achieve good agreement between predicted and measured path losses, including the effects of various types of terrain surface cover and of multiple, nonisolated obstacles. Comparisons of predictions and measurements made over a wide variety of terrain types indicate that rms prediction errors of 4 to 5 bd can be achieved in the VHF/UHF bands.
- Publication:
-
In AGARD Terrain Profiles and Contours in Electromagnetic Wave Propagation 11 p (SEE N80-19345 10-32
- Pub Date:
- December 1979
- Bibcode:
- 1979tpce.agar.....P
- Keywords:
-
- Data Bases;
- Terrain;
- Transmission Loss;
- Ultrahigh Frequencies;
- Very High Frequencies;
- Canada;
- Digital Data;
- Radio Transmission;
- Signal To Noise Ratios;
- Communications and Radar