© The Institution of Engineering and Technology
Translational-variant bistatic forward-looking synthetic aperture radar (TV-BFSAR) introduces three difficulties for the imaging algorithm, namely, large range cell migration (RCM), severe range–azimuth coupling and large azimuth spatial variance. To address these problems, an extended azimuth non-linear chirp scaling (EANLCS) algorithm is proposed. The essence is to remove the linear RCM and Doppler centroid and compensate the residual RCM and range–azimuth coupling terms with secondary range compression. Thereafter, the EANLCS operation is applied to eliminate the azimuth-dependent frequency-modulation rate and cubic phase terms. Experimental results demonstrate the effectiveness and superiority of the proposed algorithm in focusing TV-BFSAR data.
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Focusing translational-variant bistatic forward-looking synthetic aperture radar data using extended azimuth non-linear chirp scaling algorithm