The analysis of the synthetic range profile based on spatial filter bank

In this paper, a wideband imaging architecture based on subbanding and spatial filter bank using FFT is developed and its performance is analyzed in detail. The theoretical analysis shows that owing to spatial dispersion effect, the target's range profile will produce distortion with the increase in number of array element and incident angle and the distortion includes range shift and amplitude deformation. Two related theoretical formulas are deduced for the calculation of the range shift value and evaluation of the amplitude deformation extent of a target's range profile formed by the proposed imaging architecture and thereby the maximum critical number of array element is derived. When the number of an array element is less than the maximum critical element number, a target's range profile with acceptable distortion can be obtained. Specific conclusions are verified with some simulations.