Home    Forward

3.8  Conclusions and Model Recommendations

1. In the elevation angle interval between 20° to 60°, the EERS model should be executed as outlined in Section 3.3.2 using the step by step approach in Section 3.3.3. The ITU-R angle extension procedure from 60° to 90° may be used at 1.6 GHz and 2.6 GHz as outlined in Section 3.7.4. The MERS model (Equation (3-21) and Figure 3-24) and the CEFM model (Equation (3-26) and Figure 3-26) show relatively small differences with the EERS model in the angular range 20° to 60°.
2. For elevation angles between 7° and 20° the EERS model should continue to be employed in the absence of any direct measurements. The model provides a median of measured distributions at the smaller angles, but the deviation from the measured levels may be significantly larger than 5 dB at equal probability levels because of terrain blockage and multiple canopy tree fading. Where direct measurements exist, these should be substituted for the model.

---

Home    Forward