Methods and apparatus for digital jammer detection. In an aspect, a method is provided for detecting a jammer in a received waveform. The method includes filtering the received waveform to produce a filtered waveform and subtracting the filtered waveform from the received waveform to produce a difference waveform. The method also includes determining a power differential associated with the difference waveform, and detecting the jammer if the power differential exceeds a selected threshold. In an aspect, an apparatus is provided that includes a filter configured to filter the received waveform to produce a filtered waveform and combining logic configured to subtract the filtered waveform from the received waveform to produce a difference waveform. The apparatus also includes power determination logic configured to determine a power differential associated with the difference waveform, and decision logic configured to detect the jammer if the power differential exceeds a selected threshold.