Theoretical near field clutter and interference cancellation for an adaptive phased array antenna

Displaced phase center antennas with adaptive nulling capability are sometimes suggested for airborne radar applications requiring cancellation of clutter and interference. A theoretical model is developed for analyzing a linear array having two independent beamformers, which is subjected to near-field or far-field clutter and interference. Both clutter and interference are modeled using discrete noise sources. It is demonstrated that an adaptive array cancels such near field and far field sources in a nearly equivalent manner.