Performance of corrected adaptive monopulse estimation

The shape of sum and difference beams can be severely distorted if nulls in jammer directions are formed. In a previous paper a correction formula was developed that can be applied to monopulse estimation with subarray output adaptive arrays as well as to generalised sidelobe canceller (GSLC) configurations. The present paper derives the probability density function for such monopulse estimators with given adaptive beams for Rayleigh targets and jammers. With this both mean and variance can be easily calculated. For nonfluctuating targets and gaussian jammers formulas for the mean and variance are given which have to be evaluated numerically. These results can be used to analyse the performance of different corrected adaptive monopulse schemes. In particular it is demonstrated how the bias and variance of the monopulse estimates depend on jammer location, SNR, type and number of subarrays or auxiliary channels for the GSLC.