Development of an adaptive multi-channel correlation sidelobe canceller for active noise interference based on the Gram-Schmidt orthogonalization procedure

The object of the study is the process of adapting a multi-channel correlation sidelobe canceller to work in conditions of radio-electronic countermeasures based on the Gram-Schmidt orthogonalization procedure. The proposed approach allows developing a fast, recursive algorithm for searching for optimal values of weight coefficients. Such an algorithm will ensure fast adaptation of the sidelobe canceller to a complex interference-target situation, which can change rapidly. The obtained result of the coefficient of suppression of active noise interference in a constant value approaches the optimal value determined by the Wiener-Hopf equation, which indicates the effectiveness of the proposed approach. By using the Gram-Schmidt orthogonalization procedure, it was possible to obtain high stability of the procedures for calculating the optimal values of weight coefficients, in contrast to other considered approaches. The proposed approach can be practically implemented in existing radar systems for suppressing active noise interference. During the study, it was found that the adaptive multi-channel correlation sidelobe canceller in a steady-state mode works similarly to adaptive phased antenna arrays - it has the same efficiency in spatial signal selection and in compensation of active noise interference. When suppressing four active noise interference, the suppression coefficient is –23.35 dB. With an increase in the number of interferences at the input of the four-channel sidelobe canceller, the suppression level deteriorates rapidly. With five, six, seven, eight interferences – –22.90 dB, –21.54 dB, –20 dB, –17.02 dB, respectively. Such changes are due to the number of active interferences, which is greater than the number of compensation channels