An ISRJ Extraction and Elimination Method Using Phase Code Waveform for Synthetic Aperture Radar

Synthetic aperture radar (SAR) enables all-weather, all-day, high-resolution, and large-area observations, which is of great significance for comprehensive ground observation. The interrupted sampling repeater jamming (ISRJ) which can create numerous deceptive targets within SAR images, has a substantial impact on the detection of actual targets. However, inaccurate prior jamming information and the difficulty of precise parameter estimation often limit the effectiveness of existing ISRJ suppression methods. To address this issue, this letter presents an ISRJ extraction and elimination method using phase code waveform. In the proposed method, the intermittent sampling frequency is obtained by constructing its range-frequency offset map using the raw echo. Subsequently, the jamming images are derived by performing frequency offset on the received echo with the estimated intermittent sampling frequency. Finally, the jamming is eliminated by subtracting the raw SAR image and the jamming image. A series of experiments are conducted to demonstrate the validation of the proposed method.