A new method of multi-target detection for FMCW automotive radar

In multi-target situations, typically triangular FMCW radar brings out false targets and degrades the radar performance. A novel transmitted waveform and multi-target detection algorithm for automotive applications is presented in this paper. The proposed waveform is composed of three segments: up ramp, flat frequency and down ramp in every small period. Especially, the flat frequencies are modulated by a unique PN code sequence within a determinate frequency range. The unambiguous relative velocities detected in the flat frequency segment can cancel some false targets initially. Corresponding to the waveform, which combines the advantages of both FSK and FMCW formats, a progressive judgment algorithm is used in the continuous small period to further eliminate the false targets.