Graphics Programs Reference
In-Depth Information
pulse uncorrelated. Swerlings I and II apply to targets consisting of many inde-
pendent fluctuating point scatterers of approximately equal physical dimen-
sions.
Swerling III and IV (Chi-Square of Degree 4)
Swerlings III and IV have the same
pdf
, and it is given by
f
()
4σ
σ
av
2σ
σ
av
--------
--------
=
exp
σ 0
≥
(11.107)
2
The fluctuations in Swerling III are similar to Swerling I; while in Swerling
IV they are similar to Swerling II fluctuations. Swerlings III and IV are more
applicable to targets that can be represented by one dominant scatterer and
many other small reflectors. Fig. 11.57 shows a typical plot of the
pdf
s for
Swerling cases. This plot can be reproduced using MATLAB program
ÐSwerling_models.mÑ
given in Listing 11.20 in Section 11.9.
0.7
Rayleigh
G aussian
0.6
0.5
0.4
0.3
0.2
0.1
0
0
1
2
3
4
5
6
x
Figure 11.57. Probability densities for Swerling targets.
11.9. MATLAB Program and Function Listings
This section presents listings for all MATLAB programs/functions used in
this chapter. The user is advised to rerun these programs with different input
parameters.
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