For detection of weak targets in strong clutter/interference of complicated angle-

Doppler spectrum, it is highly desirable for an airborne radar system to have the

optimum or near optimum performance. As the clutter or interference spectrum is

unknown to the system and the clutter or interference environment may be

varying in time and space, i.e., non stationary and non homogeneous, the signal

processor must be adaptive with a sufficiently fast convergence-rate.