Strutt|Environmental Noise|Barrier Reflection loss provides a calculation for the angle-dependant reflection loss of a barrier with a rough surface. To be used for calculating the effect of barrier reflections. Uses equations provided in Nord2000.
The calculation assumes the surface is hard or almost hard with a rough texture of random nature.
The reflection coefficient, `\rho_E` is calculated as:
`\rho_E = exp(-2(k\sigma cos(\theta))^2)`
Where,
`k` is the wave number,
`\sigma` is the rms-value of the depth of the random irregularities in the texture. This can be approximated as 0.3 times the peak to peak irregularities,
`\theta` is the angle of incidence.
The reflection loss is then calculated by:
`\Delta L_r = 10 log(\rho_E)`
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