Measured spectrum and polarization of wideband radar signal from forest stand

Height Dependence of Electromagnetic Field inside the Forest Canopy at Meter and Decimeter Wavelengths

“…Though some more measurements have to be performed in order to better understand the impact of frequency variations on the height dependences observed. It is worth noticing that relevant considerations on this problem are available from papers [2][3][4][5][6]. Nevertheless, it was a distinct tendency for the field amplitude to grow with the height of receiver that took place in the case of prevailing lateral wave propagation mechanism.…”

“…Meanwhile, there is still need in on ground experimental data in order to both develop and validate the aerospace monitoring technologies [1], which are applicable to the forest environment. As follows from [2]- [6], two independent mechanisms of wave propagation are contributing to an overall field amplitude inside a forest canopy, provided the transmitter is placed on top the forest. The first of these is associated with the interference of two waves, one of which propagates along the line-of-sight, while the other reaches the receiver after being reflected from the ground.…”