Multiplier-free filters for ground clutter suppression

The transmission characteristics of the usual two- and three-pulse feedforward cancellers have certain properties such as narrow clutter notch and uneven transmission region which may be undersirable in many applications. Recursive filters need multipliers and may be too expensive if large quantities of filters are required. The paper presents a class of multiper-free digital recurisive filters for ground clutter suppression which combine desirable transmission characteristics with low cost. The filters are particularly designed for a CW radar with peformed fixed beams. The usual problems associated with the infinite impulse response of recursive filters therefore do not occur.