Adaptive beamforming for wideband jamming cancellation

This paper presents two important results of our recent studies on adaptive wideband beamforming using subarrays and linear frequency modulation (LFM) for high resolution target image. By transmitting periodical sweeping waveforms, the received non-coherent signals, such as jammers, become nonstationary and therefore require special treatment to predict the system performance analytically. We approach the problem by constructing the system's covariance matrices from the elemental correlations. By incorporating the subarraying techniques and array steering methods in the associated elements, it is possible to compare the system performance adopting different signal processing schemes such as time-delay (TD) and phase-weight (PW) steering methods for the auxiliary array. Simulation results show that PW method perform better than TD method.