Abstract:

Focusing on the problem of the space variation for the envelope migration in bistatic SAR, a bistatic chirpscaling (CS) algorithm is proposed based on an exact analytical bistatic point target spectrum, which is obtained by a geometry-based formula (GBF) method in tandem mode. Unlike the imaging algorithms applied in the wavenumber domain, no interpolation operation is used during the whole imaging, the focusing process is implemented in the frequency domain with celerity. The proposed algorithm can handle the bistatic tandem case with large baseline to ratio due to the high precision of the spectrum. Simulation experiments validate the effectiveness of the proposed method.