 This paper proposes a new method for accurately estimating the jamming edge of digital radio frequency memory, DRFM, base repeater jamming signals. This method uses the short-time fractional Fourier transform, STFRFT, spectrogram of the received signal to detect the jamming edge, as well as the difference of boxes, DOB, filter and time domain decombolition, TDDC, curve to estimate the exact location of the jamming edge. The proposed method was tested on simulated and real data and compared against other existing methods. The results showed that the proposed method outperformed other methods in terms of jamming reconstruction and suppression performance. This article was authored by Boen Haun, Xiaodong Chu, Xiaoping Yang, and others.