Design of moving-target-indicator filters using a quadrature channel

The letter presents a design method for moving-target indicators (m.t.i.) with minimal transient response time. We shall show that the conventional linear-phase real-coefficient digital filter (type A) may be tranformed to an equivalent nonlinear-phase real-coefficient filter (type B), but having half the passband order. Further, the type-B filter can be transformed to obtain a filter of an identical magnitude response, but having half the transient response time (type C).