ADBF in the presence of fixed interference perturbation [adaptive array signal processing]

The conventional ADBF algorithm can only form a narrow notch and its performance is quite good when the prior knowledge of interference is accurate. However, when the knowledge of interfering signals is imprecise, which is often the case in practice due to the differences between the assumed signal arrival angle and the actual signal arrival angle, the interference may be moved out of the notch when the position of interference perturbations and the interference cannot be cancelled completely. The SNW approach, proposed in this paper, can generate a fixed wide notch while it can adaptively reject the other interferences. The weights forming the fixed wide notch can be calculated offline according to the actual environment so it does not add extra burden to the entire computation. Its performance is much better than that of MVDR in the present of array errors and interference perturbations.