Focusing Bistatic SAR Data in the Wavenumber Domain Using Linearized Weighted LBF

A weighting solution based on the original Loffeld's bistatic formula (LBF) is addressed briefly in this paper to deal with the cases with noticeable difference between transmitter and receiver's velocities. The published LBF-based approaches use range blocks to deal with the range variance. Alternatively, a new wavenumber domain algorithm is proposed by using the linearization of bistatic range, which follows the same routine of the monostatic Omega-K algorithm. The approximation in this range linearization is examined with space-surface hybrid and airborne bistatic configurations. Due to large phase error for the airborne case, a second phase multiply have to be used in its focusing. This approach results in a good focusing performance over simulated data.