Contents I. Introduction
Basically, a radar system can perform functions such as detecting, tracking and displaying the target and the region by receiving Electromagnetic (EM) waves reflected from the targets. RCS of simple geometries can be computed exactly by a solution of the wave equation in a coordinate system for which a constant coordinate coincides with the surface of the body. The exact solution requires that the electric and magnetic fields and just outside the surfaces satisfy certain conditions that depend on the electromagnetic properties of the material of which the body is made [1]. Calculation of Radar Cross Section (RCS) of geometric structures such as aircraft, helicopters and Unmanned Aerial Vehicles (UAV), has a military oriented strategic precaution for this reason, alternatively, numerical EM solution techniques are used for RCS measurements [2]–[4]. Differential and integral equations must be used in the appropriate boundary conditions in order to be able to calculate the fluctuating waves from Physical Optics (PO) predicts the induced surface current on a random body by the incoming radiation [5]–[6]. When the energy emitted by the radar hits the target, current is induced on the target surface. The current spreads EM energy in all directions. EM waves coming into the target's body create a current on the target. This induced current is proportional to the magnetic field strength. In the shaded parts of the target, the current is zero. Thus the approximate value of the current is as follows. \begin{equation*} J_{s}\approx \begin{cases} 2 \hat{n}\times \vec{H}_{j},\ for\ bright\ sections\\ 0, for\ shadow\ sections \end{cases} \tag{1} \end{equation*}
