RFI detection and removal in Range-time Azimuth-frequency domain

In this paper, we report a radio frequency interference (RFI) detection method which is exclusively sensitive to the temporally pulsed wide-band signal. We use local autocorrelation in the range-time azimuth-frequency domain instead of typical range-frequency azimuth-time domain. Traditional RFI detectors assume that RFI have time-varying wide-band (TVWB) and / or time-stationary narrow-band (TSNB) features. The proposed method assumes that there is another type of RFI, namely, intermittently transmitted wide-band RFI. This kind of RFI superimposes on the SLC image however, its short pulse duration hinders us to detect it in range-frequency azimuth-time domain. Contrarily, in range-time azimuth-frequency domain, this kind of RFI can be detected easily. Here, we present a basic methodology and experimental results.