Method and device for frequency-modulated continuous-wave radar detection with removal of ambiguity between distance and speed

摘要

In a method and device for frequency-modulated continuous-wave radar detection with removal of ambiguity between the distance and the speed, the radar sends out at least alternately two parallel and discontinuous frequency modulation ramps that are slightly offset by a frequency variation ( DELTA F), the frequency switching from one ramp to the other at the end of a given duration (Tf), the distance from a detected target being estimated as a function of the difference in phase ( DELTA phi ) between a received signal (S1(t)) corresponding to the first ramp and a received signal (S2(t)) corresponding to the second ramp, the speed of the target being obtained from the estimated distance and the ambiguity straight line associated with the target. The disclosed method and device can be applied especially to radars for automobiles.