Real-time DSP for reflected power cancellation in FMCW radars

A novel real-time DSP scheme is proposed for leakage cancellation in monostatic frequency modulated continuous wave (FMCW) radars. With the digital implementation, the proposed scheme shows a much more precise control of the leakage cancellation, compared to conventional analog implementation. Other advantages also include that the DC offset existing in analog mixers, affecting the cancellation performance, are eliminated. A radar test bed at 26 GHz has been built. The measurement results show more than 40 dB suppression in transmitter leakage, which proves the effectiveness of the proposed approach.