Abstract: In the fields of detecting non-cooperative burst communication signals, the existing various detectors have failed to make full use of the continuity of the signals in frequency domain. Employing the frequency domain continuity of signals, a new detector is presented in this research. It searches the maximum energy by sliding in both carrier location and bandwidth. Both theoretical analysis and simulations illustrate that, the proposed detector outperforms that of Power-Law method more than 2 dB.