The sampled aperture data include data that do not correspond to echo returns from a beam transmitted by the antenna.A covariance matrix is generating using the sampled aperture data. In a radar system, sampled aperture data are received from an antenna array.
A direction of arrival is determined from which at least one jammer is transmitting a signal included in the sampled aperture data, based on the eigenvalue decomposition.(d) determining a respective direction of arrival from which each of a plurality of jammers is transmitting a signal included in the sampled aperture data, based on the eigenvalue decomposition, using a super-resolution subspace algorithm to estimate the direction of arrival of signals from each of the plurality of jammers. The situation is exacerbated by introduction of stealth technology to reduce the radar cross section (RCS) of unfriendly aircraft targets.
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