Suited For The Project To Achieve The Generalized Sidelobe Canceller Beamforming Control Study

Adaptive array technique is one of the branches in array signal processing. It has played important roles in both military and commercial application fields, such as radar, sonar, communication, biomedical and so on.When the target signal is in the sample data or the interference falls into mainlobe, the performance of adaptive digital beam former will be degraded. Block Matrix method is proposed in Generalized Side Canceller which preprocesses the sample data via a block matrix so that the influence of signal-of-interest and mainlobe jamming is diminished. This method avoids mainlobe distortion and has good performance cancelling interference. As for Generalized Side Canceller (GSC), three concrete problems may be met in practice, such as Estimation Direction-of-arrival (DOA) mismatch, array perturbation and sample snapshot limited.We reviewed the classical models and algorithms in robust adaptive beamforming, and improved the traditional algorithm of GSC which is suitable to be used in practice. First, for the existence of mismatched signal steering vector and moving interference, an improved GSC, based on derivative constraints and direction constraints, have been analyzed. Second, the method of diagonal loading can lower the height of adaptive beam pattern, and no effect on nulling depth of interference. Third, in the situation of a few snapshots, we analyses the reduced rank adaptive filtering algorithms based on the GSC structure. The improved algorithm's feasibility and robustness were analyzed and verified by the simulation.