Dependence of processing gain and interference immunity of adaptive narrow-band beam-formers on angular locations of interference sources

The dependence of processing gain and interference immunity of adaptive narrowband linear beamformers on angular locations of single, double, and L interference sources is investigated. Corresponding expressions of these figures of merit are derived. It is found that different angular locations may correspond to the same processing gain and interference immunity. The former varies from unity to a maximum value which under certain conditions is independent of both the array geometry and the number of interference sources. The null directions of the quiescent beam correspond to unity processing gain and 100% interference immunity. However, there are always other directions where the processing gain is unity but the interference immunity is extremely small. The maximum processing gain is always associated with 50% immunity.<
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