Improved Hybrid Integration Detection Algorithm of Moving Targets with Fast Radial Velocity Based on Single-channel SAR System

Moving targets are smeared and defocused in SAR images by the series range walk and azimuth mismatch which are caused by the fast radial velocity, so it is difficult to detect them. A novel detection scheme is proposed via the airborne single-channel SAR data. The dual-channel can be retrieved by desampling the airborne SAR data in the azimuth direction. Stationary targets and the spectrum splitting of moving targets can be eliminated by coherent subtracting of the dual-channel data. Moreover, moving targets amplitude are double. Then, the Dechirp processing and Hough transform can be applied to accumulate the energy of moving targets. As a result, the integration gain is improved significantly. Comparing with the traditional hybrid integration approach, the proposed scheme can eliminate the clutter and collect the energy of moving targets. The effectiveness and superiority of the proposed scheme are demonstrated by the simulated and real data.