Modified direct data domain approach without space-time aperture loss

We present herein a direct data domain approach without space-time aperture loss for airborne surveillance radar system. The approach is composed of three stages, i.e. reduced-resolution angle-Doppler image formation, full-dimension clutter subspace re-conformation and subspace projection. Simulation results confirm that the performance improvement achieved even secondary data-free, a feature that is particularly attractive for applications in heterogeneous environments.