Bullington Figure 12
Q: How do I use the Bullington “Figure 12” setting?
A: Figure 12 is used as one method of computing terrain attenuation as described in "Radio Propagation for Vehicular Communications," by Kenneth Bullington (IEEE Transactions on Vehicular Technology, vol. VT-26, no. 4, November 1977).
The Figure 12 setting is one of several loss methods available in the TAP Bullington model. Figure 12 is applicable to obstructed paths. The figure in the Bullington paper consists of a series of nomographs used to determine the loss value based on the horizon angle from each end of a path:
The nomograph has been digitized and can be applied to a propagation study in TAP by selecting the Figure 12 Loss Method in the Bullington Template for the study.
Since the Figure 12 method is applicable to blocked paths, if the topography elevation data along the path indicates a line-of-sight path, the program reverts to the Obstacle Peak Loss Method when the Figure 12 method was selected.
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