Wideband Interference Suppression for SAR Based on Synchroextracting Transform

In the complex electromagnetic environment, the imaging quality of the synthetic aperture radar (SAR) will be severely degraded by the wideband interference (WBI). It is difficult to mitigate the WBI due to its wide frequency band. To address this problem, we propose a method based on synchroextracting transform (SET). First, a WBI-corrupted SAR echo is transformed into the time-frequency (TF) domain by the short-time Fourier transform (STFT). Then the WBI is detected in the TF domain by thresholding and a TF mask for the WBI is generated. Next, the synchroextracting operator (SEO) is calculated and the SET result is obtained. Finally, the WBI is reconstructed based on the SET result and is subtracted from the WBI-corrupted SAR echo. Experimental results with the measured WBI-corrupted SAR data demonstrate the effectiveness of the proposed method.