Abstract: A wideband imaging architecture based on subbanding and Doppler filter bank using FFT is developed and its performance is analyzed in detail. The theoretical analysis shows that owing to Doppler dispersion, the target’s range profile will produce distortion with the increase in target velocity. The distortion includes range shift and amplitude deformation. At the same time, two related theoretical formulas are deduced for the calculation of the range shift value and evaluation of the amplitude deformation extent of a moving target's range profile formed by the proposed imaging architecture and thereby the maximum critical velocity is derived. When target velocity is less than the maximum critical velocity, a moving target’s range profile with acceptable distortion can be obtained. Specific conclusions are verified with some simulations.