| 摘要 |
A method for finding positions of objects using a MIMO FMCW radar, in which a ramp-shaped frequency-modulated radar signal is transmitted whose modulation pattern has a sequence of time-delayed successive ramps, switching over is periodically performed between at least two switching states (TX) in the clock pulse of the successive ramps, the switching states differing in the selection of the antenna elements used for transmission and reception, received radar echoes are down-converted with the transmitted signal into a baseband, the baseband signals obtained for the various switching states (TX) are transformed into spectra, based on which distances and relative speeds of the radar targets are determined, and the phases of the baseband signals obtained for various switching states are compared for determining position-finding angles of the radar targets, characterized in that the baseband signals are separately subjected to a two-dimensional Fourier transform for each switching state (TX), a ramp-for-ramp transform being performed in the first dimension and a transform being performed over a ramp index j in the second dimension, the ramp index counting the ramps within the sequence, using window functions which contain the waveforms of the baseband signals except for a displacement along the time axis, and the spectra obtained for various switching states are subjected to a frequency-dependent phase correction compensating for the time offset of the ramps. |
