Monopulse estimation with adaptive arrays

The angle estimation problem with an adaptive phased array radar is considered. Because of the adaptation, the shape of the sum and difference beam is perturbed, therefore the usual monopulse formula produces errors if applied to the adaptive sum and difference beam outputs without correction. Correction values are derived for the slope and bias of the adaptive monopulse ratio for a planar array, and it is shown by example that this corrected adaptive monopulse procedure may be applied to the sub-array outputs of a large array with partial digital beamforming. The bias can be further reduced by iterating the procedure, resulting in a `multistep corrected adaptive monopulse procedure´. This technique is also applicable to sub-array output data. The method is applicable to arbitrary planar or volume arrays