2. Optimization of Passive Remote Sensing Systems
In the second part of this submission we consider passive systems of remote sensing, where Solar radiation is used. Systematic decreasing of Solar's radition intensity in spectral band make it possible to express the spectral dependence of ratio signal/noise
y as
y = y0
+ yt(l -
l0)
where
y0=
y
(
l
=
l0);
l0 = 3 m c m.
»
In this case quantity of information is assessed as
Where
lå - parameter, characterizing total width of transparant window of passing of atmospehere, used for passive sensing within band
(
l-
l0);
Dl - width of the one spectral channel.
In order to syntesize the optimal system we use aforesaid principle lowering of dimension. We assume, that regularity of dependency between parameters
lå and
(
l-
l0), i.e. function
lå = f(
l-
l0) is known. In first approach we assume linear type of said function
lå = k (
l -
l0), and designating
l1 =
l -
l0
we have
In order to investigate function (8) for maximum on
l1 we use above rule and obtain following equation
If we receive conditionally even distribution of noises in spectral band 3 - 5 mcm, equal to
and presence of following fuction for hypothetical optical - electronic channel of radiometer in said spectral band
y(l) = 111 - 50
l1, (10)
then solution of (9) taking into account of (10), when
y0 = 111,
yt = 50;
k=1 give us
l1
»1,7 m c m.
Thus, held analysis make it possible to conclude that there is possibility of existence of optimum spectral band width, within 3 - 5 mcm where maximum amount of authentic information is attained.
Reference
-
Asadov H.H. 2000. Synthesis of one subclass of measuring systems on the basis of dimension lowering principle. Baku, Proceedings of Azerbaijan Technical University, v. VIII., ¹ 1, p. 51 - 54.
- Asadov H.H. 1982. Optimization of the process of registration on electron - beam tube. Moscow, Journal "Radiotechnics", ¹ 2, p. 64 - 66.
