An Ultrawideband Radar Target Range-Domain Coherent Accumulation Method

To address the challenges of poor detection robustness caused by angle scintillation and the inability to achieve effective coherent accumulation in the range domain for ultra-wideband (UWB) radar extended targets, this paper proposes a novel single-pulse range-domain coherent accumulation method for UWB extended targets. First, the full-bandwidth signal model is approximated and converted into a fully digital array model. When full-bandwidth conditions are not met, the wideband target’s Radar Cross Section (RCS) scattering centers are transformed into the subarray domain. The original target’s RCS phase and amplitude are reconstructed through the subarray, and phase modulation is employed to adjust the beam direction, enabling a scan over the observed angles and achieving high gain on the target to obtain the maximum RCS value. Subsequently, digital beamforming (DBF) is applied to the target’s wideband range profile data to complete coherent accumulation in the range domain.