Performance of Sidelobe Blanking Systems

Sidelobe blanking systems are useful in preventing acquisition of strong targets in the antenna sidelobes and also in rejecting pulsed interference originating in the sidelobes. The analysis of a common two-channel system is presented in which the relationship between the probability of main-lobe detection and the probability of sidelobe detection are given in terms of false-alarm probability, signal-to-noise ratio, and the ratio of sidelobe levels of the two channels. The numerical results given provide a basis for the selection of the sidelobe blanking channel antenna gain and threshold levels.