Improved doppler warping method for airborne radar with non-sidelooking array

The clutter distribution of airborne radar with non-sidelooking array antennas varies with ranges and samples in different range gates are not independent identically distributed vectors,so that the statistical Space Time Adaptive Processing (STAP)methods degrade.Traditional Doppler Warping(DW)method does compensation only in the mainlobe direction and there is still large clutter dispersion in the directions of sidelobe,so it can only alleviate the clutter nonhomogeneity in some degree.An improved clutter suppression method for non-sidelooking airborne radar,namely Modified Doppler Warping(MDW) method,is proposed.This improved method involves in a preprocessing with DW method to bring clutter spectrum of different range gates together in the mainlobe and subsequently clutter compensation to accomplish space angle of different range gates alignment at multiple Doppler bins.Simulation results show,compared with Doppler warping algorithm,the proposed method can further reduce the clutter nonhomogeneity of non-sidelooking array and performs significantly better than DW algorithm while the computation load is almost equivalent to it.