constfloatfLevelDropThreshhold=-90.f-30.f-11.f;//90 dB Power level of Diesel; 30 dB masking; 11 dB initial power level drop
constfloatfReflectionPenalty=-10*log10f(0.8);//Level reduction of a reflection with reflection factor rho = 0.8 from ISO9613-2
constfloatfDiffractionPenalty=2.5f;// Minimum level reduction of a diffracted signal into the shadow region for a low frequency (Taken from BA Filbert Figure 16. UTD)