A novel time-domain imaging approach for one-stationary bistatic low frequency ultra wide band SAR based on elliptical polar coordinate

A novel bistatic fast factorized back projection (BFFBP) method for one-stationary bistatic low frequency ultra wide band synthetic aperture radar (UWB SAR) imaging is proposed in this study. This method can precisely deal with azimuth-variance of range cell migrations and motion errors, and achieve computational performance in parity with frequency-domain algorithms. First, the imaging geometry with motion errors in elliptical polar coordinate is provided. Then, based on the subaperture imaging model, the analytical expressions for sampling requirements are derived from the bandwidth angle. Finally, the concrete realization and practical computational load of the BFFBP algorithm are discussed. Simulation data processing results are shown to demonstrate the validity of the proposed approach.