William Kozma Jr. , , , , Adam C. Hicks , , , , and Brian C. Lain

Abstract: Development of improved clutter modeling is critical to co-existence of incumbent and entrant systems. Most clutter modeling approaches center on a median clutter loss term and a statistical distribution representing location variability. In this paper we show that an overlooked component of clutter model development is time variability. Through measurements at two transmitter sites and at two frequencies, we provide data showing how changes in foliage during the year can have a significant impact on clutter loss, in particular at higher elevation angle path geometries.

Keywords: frequency measurement; radio transmitters; clutter; propagation losses; loss measurement; geometry; statistical distribution

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