Mitigation of jamming of an angle estimation system using multi-mode antennas

The problem of obtaining accurate estimates of the angle of arrival (AOA) of an unknown source using a single aperture multi-mode antenna in the presence of a jamming signal is considered here. Two approaches, one based on maximum likelihood and the second based on a modified MUSIC algorithm are presented. A simulation study is carried out to test the efficacy of the algorithm. It is demonstrated that when the signal and jammer are uncorrelated and when they are not too close to each other in angle, good angle estimates are obtained even in the presence of powerful jamming.