Target distance and velocity measurement algorithm to reduce false targetsin FMCW automotive radar

A Frequency Modulated Continuous Wave (FMCW) radar using only in-phase chan nel is advantageous for automotive applications. In this radar, it is neces sary to search the pairs of beat frequencies in an up-chirp mode and a down -chirp mode to measure the distances and the velocity of multiple targets s imilarly to a FMCW radar with both of in-phase and quadrature-phase channel However the number of combinations to search the pairs is larger than that for the FMCW radar with both of in-phase and quadrature-phase channel. The refore: false targets by mistaking the combination of these pairs increase. In this paper, we propose a novel measurement algorithm to reduce the fals e targets. We extract only the beat frequencies of the relatively moving ta rgets using the differential frequency power spectrum of the up-chirp mode and the down-chirp mode. We can reduce the number of selected incorrect pai rs by separating the stationary targets and the moving targets. We have con ducted some simulations to confirm the capability of the proposed measureme nt algorithm. It was shown that the false tar get appearance probability is reduced without significant deterioration of the target detection probabil ity.