On the Use of UTD-Based Models for RF Path Loss Prediction Due to Diffraction on a Forest-Covered Ridge

Irregular terrains covered with forest vegetation represent a challenging scenario for radio planning. A case of particular interest is the one where forest-covered high hill or mountain interposed to link, which typical diffraction loss models usually apply as good approximations, even disregarding influence. Pragmatic approaches incorporate contribution, such adding clutter height, improve accuracy little further. In this scope, paper assesses performance some based on Uniform Theory Diffraction (UTD) RF path prediction in ridges. Special attention goes hybrid model uniform layer over wedge that represents ridge, and its influence incorporated into coefficient. The predictions are compared measurements from mountainous region USA, statistical adherence measured data discussed. Overall, slightly better was confirmed, performing best frequencies below 910 MHz.