Monopulse estimation of target DOA in external noise fields with adaptive arrays

This paper defines an algorithm for the estimation of the radar target direction of arrival (DOA) when electromagnetic interferences impinge on an adaptive planar array. First, the case of a fully adaptive array is considered and the target DOA is estimated via the maximum-likelihood principle. The performance of the derived algorithm is also found. Subsequently, the case of adaptivity applied to subarrays is examined. The performance losses of the adaptive subarray configuration with respect to the fully adaptive array are determined. Also the distortions of the antenna patterns are assessed