Simple Transmission Line Model from RET Results for Propagation Through Vegetation

Zabihi, Roshanak; Vaughan, Rodney G.

doi:10.1109/apusncursinrsm.2018.8608622

Cited by 4 publications

(2 citation statements)

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“…These experimental observations suggest that a simpler model than the RET approach, comprising just two propagation mechanisms, should be feasible. For example, separate transmission line models have been discussed in the context of dual slope path gain using the variables as the pair of slopes and the breakpoint separating them, for a given frequency [33].…”

Section: (This Frequency Dependence Is Normally Omitted In Acoustics mentioning

confidence: 99%

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Simplifying Through-Forest Propagation Modelling

Zabihi

Vaughan

2020

IEEE Open J. Antennas Propag.

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Propagation analysis and modeling is critical for radio systems design, but remains a challenge for most throughvegetation situations, including forests. Transmission through such inhomogeneous mixed media is complicated by the many different propagation mechanisms and the complexity of the randomness. This means that accurate, purely physics-based analysis is unlikely to be practical (conveniently computed), and similarly, that practical, purely random modeling is unlikely to be accurate. Through-vegetation propagation models, including the standard radiative energy transfer (RET), are not very accurate in the sense that the uncertainty can be tens of dB, and this seems to be an accepted limitation for vegetation. A simpler propagation model, which maintains or improves accuracy, but keeps a reasonable association with the physics, would be insightful. This paper discusses such a model. It comprises two parallel transmission mechanisms: direct transmission through a succession of trees, which is modeled by a simple linear transmission line; and transmission across the forest top, which is modeled by simplified multiple-edge diffraction. The model is examined using recently-published experiments over a long path-length. It is demonstrated that this two-mechanism model can provide an accurate fit to the dual-slope profile of throughforest propagation over a long distance which is not possible with the RET model.

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Section: (This Frequency Dependence Is Normally Omitted In Acoustics mentioning

confidence: 99%

“…2a. Intuitively, a tree can be modeled as a two-dimensional block, e.g., [33]. For simplicity, the trees are modeled as regularly spaced and with constant thickness, see Fig.…”

Section: B Multi-layer Transmission Linementioning

confidence: 99%