Multichannel Azimuth Reconstruction of High Resolution Wide Swath SAR Via Vandermonde Matrix

To overcome the contradiction between wide unambiguous swath and high azimuth resolution in synthetic aperture radar (SAR) system, a multi-channel reconstruction method is investigated to unambiguously recover the azimuth signal even for nonuniform spatial samplings. This reconstruction method is derived from matrix inversion method under least square principle. By taking the system additive noise into consideration, the ill-condition problem of the conventional matrix inversion method is overcome. By decomposing the system matrix into a Vandermonde matrix and a diagonal matrix, the reconstruction filters can be easily achieved by calculating the inversion of the Vandermonde matrix which is independent of the Doppler frequency.