![awe com winprop awe com winprop](https://img.yumpu.com/7475002/1/500x640/winprop-awe-communications.jpg)
When multipath is expected, the empirical model Longley-Rice area mode is the best choice, and also the Two-Ray empirical may be used. If there are mainly line-of-sight conditions, the deterministic models taking terrain features into account (Longley-Rice point-to-point, Okumura-Hata with diffraction and ITU Rec P.1546) perform best.
![awe com winprop awe com winprop](https://img.yumpu.com/31148502/1/184x260/pdf-file-16-mb-awe-communications.jpg)
However, the accuracy is better for some models at a particular location with certain characteristics.
![awe com winprop awe com winprop](https://image.slidesharecdn.com/readme-121202101428-phpapp02/95/readme-1-638.jpg)
For the best fitted model over all the measurements at the three locations, the mean difference can be up to 15 db with a standard deviation of 5 db. Generally, the prediction accuracy of the different models in the terrain that has been measured is not very high. The model parameters have been selected based on best guess and without any tuning to best fit the measurements. The models available in WinProp that have been compared are the empirical Okumura-Hata model and Longley-Rice area mode model (Irregular Terrain Model), and the deterministic/empirical ITU Rec P.1546 model, Longley-Rice point-to-point model (Irregular Terrain Model), Dominant Path model (AWE proprietary) and Two-Ray model (AWE proprietary). The comparisons are limited to one frequency, 312 MHz, and three geographical locations in eastern Norway. This report compares measurements of path loss with predicted path loss from different propagation models implemented in WinProp. The main results concerning multipath propagation are to be published at Milcom To support the planning of the measurements, the prediction tool WinProp from AWE Communications, Germany, was procured. The purpose was to gain knowledge about what requirements that must be set to a wideband waveform operating in Norwegian terrain. 1 FFI-rapport 2015/01525 An evaluation of the radio propagation models available in WinProp from AWE Communications Vivianne Jodalen Forsvarets FFI forskningsinstitutt Norwegian Defence Research Establishmentģ FFI-rapport 2015/01525 An evaluation of the radio propagation models available in WinProp from AWE Communications Vivianne Jodalen Norwegian Defence Research Establishment (FFI) 9 December 2015Ĥ FFI-rapport 2015/ P: ISBN E: ISBN Keywords Bølgeforplantning Frekvensplanlegging UHF (Ultra High Frequency) Signaldemping Kanalmodeller Approved by Jan Erik Voldhaug Anders Eggen Project Manager Director 2 FFI-rapport 2015/01525ĥ English summary Propagation measurements at VHF (30-88 MHz) and UHF ( MHz) were conducted in Norwegian terrain in 2014 as a collaborative project between the Communication Research Centre (CRC) Ottawa, Canada, and FFI.