  In this paper, constant false alarm rate (CFAR) detector-based approaches are
proposed for interference mitigation of Frequency modulated continuous wave
(FMCW) radars. The proposed methods exploit the fact that after dechirping and
low-pass filtering operations the targets' beat signals of FMCW radars are
composed of exponential sinusoidal components while interferences exhibit short
chirp waves within a sweep. The spectra of interferences in the time-frequency
($t$-$f$) domain are detected by employing a 1-D CFAR detector along each
frequency bin and then the detected map is dilated as a mask for interference
suppression. They are applicable to the scenarios in the presence of multiple
interferences. Compared to the existing methods, the proposed methods reduce
the power loss of useful signals and are very computationally efficient. Their
interference mitigation performances are demonstrated through both numerical
simulations and experimental results.
