Radar Equation  Introduction
 The radar equation relates P_{r}
= received power to:
 parameters of the radar
system
 targets
 scattering properties
 target location
 Two types of targets:
 Point  building, plane, etc
 distributed  rain, snow
First, let's derive the radar equation
for a point target (it's easier than for distributed
targets).

For an isotropic
antenna (one that transmits in all directions)
transmitting at some power P_{t}, the
power density at the target will be
With a directional
antenna, the power
density at the target will be
How much energy is
intercepted by the target?
