Evaluation of the performance of a simplified MTI canceller selection rule for FUCAS

A rule for the selection of a particular canceller from a set forming part of the FUCAS phased array radar system, is described. The rule takes clutter and noise suppression into account instead of signal to interference ratio (SIR) at the filter outputs. For a five-pulse canceller bank, performance loss when the wrong canceller is chosen is at most, 6 db, except where clutter center velocity is midway between the two canceller stopbands. Here loss may increase to 9 db. A bank of three-pulse cancellers shows maximum performance loss of 4 db, outside the region of target suppression in the stopbands. A strong correlation is shown between variation of the canceller transmission at the target velocity, and the variation in performance loss and probability of incorrect decision.