A new reduced-dimension GSC for target tracking and interference suppression

To deal with the beam tracking issue in phased array when interferences are removed by adaptive beamforming, a new generalized sidelobe canceller(GSC) that can realize beam tracking is proposed in this paper. First of all, with the estimated angles and the current training samples, it constructs a new reduced-dimension blocking matrix with the number of interferences as the number of columns, which is realized through linear combinations of column vectors in the array covariance matrix, without eigen-decomposition. Then the reduced-dimension blocking matrix is worked on both sum and difference beams, estimating adaptive sum and difference weights and realizing the anti-jamming exporting. Finally, it realizes beam tracking through the monopulse technology. This reduced-dimension generalized sidelobe canceller (GSC) can suppress interferences effectively when tracking the target, with the advantages of simple structure, less computation and little distortion of monopulse ratio curve. The processing results of simulation and measured data show the effectiveness and advantages of this reduced-dimension generalized sidelobe canceller (GSC).