Multisignal Direction-Finding of the Radio Sources at Single Frequency as Ill-Posed Problem

In the article three methods for ill-posed problems solving in the field of multisignal direction-finding is described. Direction-finding is realized by antenna systems consist of near-omnidirectional antennas (doublets). Two antenna system types are considered in the article: circular and linear. Direction-finding problem solving methods are proposed. These methods base on overcomplete basis introduction and - p-regularization procedure, signal decomposition on a sum of exponential functions and multicriterion mathematical programming methods. Also, point and interval estimates of directions and amplitudes obtaining methods are described.