The invention discloses a frequency-modulation continuous-
wave radar self-
interference elimination method based on a fractional order least
mean square. In the method, a frequency-modulation continuous-
wave radar system uses a
baseband de-sloping working mode, and operation of
radio frequency domain self-interference cancellation is taken as a
precondition. The method comprises the following stepsof firstly, carrying out multipath
phase modulation on a
baseband emission
signal of a frequency-modulation continuous-
wave radar to generate a reference
signal; secondly, carrying out multipath
amplitude modulation on the reference
signal and generating a cancellation signal through multipath vector synthesis; then, before
baseband de-sloping
processing, carrying out self-interference cancellation on the cancellation signal and a
radar receiving signal; and finally, using a fractional order
least mean square algorithm to carry out feedback adjusting on multipath modulation coefficients so that the cancellation signal approaches the self-interference signal and a purpose of self-interference signal
elimination is realized. In the invention, the self-interference signal in the
radar receiving signal can be restrained and a
target signal is not influenced so as to increase a detection probability and precision of the
radar to a target.