| 摘要 |
A method for locating objects using an FMCW radar, in which: – a ramp-shaped frequency modulated radar signal is transmitted, the modulation pattern of which has a plurality of successive ramps with different gradients, – received radar echoes are mixed down with the transmitted signal into a baseband, – the baseband signal is recorded ramp-by-ramp and transformed into a respective spectrum, – a noise estimation for distinguishing between radar targets and noise or clutter (34) is undertaken for each signal peak (30, 32) found in the spectrum, and – the distances R and relative speeds v of the radar targets are determined by comparing the frequency positions of the mutually corresponding signal peaks in the spectra obtained for the various ramp gradients, – wherein the modulation pattern has at least one family of a plurality of ramps with the same gradient, – the baseband signal is transformed for each family of the ramps with the same gradient into spectrum in a two-dimensional frequency space, in which a first frequency variable fk represents a scanning index k within each ramp and the second frequency variable f represents a ramp index j, – the noise estimation is carried out in both dimensions of the frequency space, and – the distances R and relative speeds v are determined on the basis of the first frequency variable fk. |
