425
p(x,y) = s e
+ S 2 e ^cos(4r-x)
Now, the surface is determined by:
- small scale parameters: s, 1 respectively the height RMS and the correlation length
- large scale parameters: S,L,P respectively the height RMS, the correlation length and the period
Small scale
Large scale
- s : Standard deviation of the heights
-1: Correlation length
- S : Standard deviation of the heights
- L : Correlation length
- P: Periode
Look Observation
6 : Incidence angle
d> = 0° : Perpendicular
In this section, we will present the effect of the surface parameters (s,l) on the behaviour of the model.
4.1 Isotropic surfaces: S=0
The case presented here corresponds to a pea field. The height RMS (s) and the correlation length (1) arc
measured with a variation ds and dl (s=s±ds l=l±dl). With different value of s and 1, we see that a
decrease of the surface roughness involves an increase of the slope of radar cross section with incidence
angle.
Variation of the Height RMS (s)
P2 (pea sowing Held)
Configuration: CHH (5.35 GHz)
Height RMS s = 0.8 cm
Correlation lenght 1 = 4.2 cm
ds = 0.1cm (measured standard deviation of s )
(ks = 0.9 Id = 4.7)
Variation of the Corr elation Lenght flf
P2 (pea sowing Held)
Configuration: CHH (5.35 GHz)
Height RMS s = 0.8 cm
Correlation lenght 1 = 4.2 cm
dl = 0.9 cm (measured standard deviation of 1 )
(ks = 0.9 Id = 4.7)
