OFDM radar sensor having a plurality of transmitting channels and at least one receiving channel, having a control and evaluation device (16, 34, 38, 40, 42) which is designed for an operating mode in which the plurality of transmitting channels transmit respective signals, wherein a signal in a respective transmitting channel comprises a sequence of OFDM symbols, and wherein the signals in the plurality of transmitting channels are transmitted at the same time, wherein the OFDM symbols transmitted in a respective transmitting channel each have OFDM subcarriers which are orthogonal to the OFDM subcarriers (92, 94) of the OFDM symbols (82, 84) simultaneously transmitted in the other ones of the plurality of transmitting channels, wherein, for a reception signal received by the at least one receiving channel, signal components of the reception signal are spectrally separated, wherein OFDM subcarriers are divided among the signal components according to their division among the transmitting channels in the OFDM symbols (80, 82, 84) simultaneously transmitted in the transmitting channels, and the signal components are evaluated, characterized in that the OFDM radar sensor has, at least for first transmitting channels (10.1) of the plurality of transmitting channels, a plurality of buffers (18; 20) for each first transmitting channel (10.1) for parts of a signal waveform of the signal to be transmitted in the transmitting channel (10.1), wherein, in the operating mode mentioned, at least for the first transmitting channels (10.1), the signal waveform of the signal to be transmitted, which comprises the relevant sequence of OFDM symbols, is progressively calculated in parts for each transmitting channel (10.1), wherein the plurality of buffers (18; 20) are used alternately to store a calculated part of the signal waveform and to read out a previously calculated and stored preceding part of the signal waveform which is subjected to digital/analogue conversion and is transmitted, wherein a respective part of the signal waveform is calculated and is stored in one of the buffers, whereas a preceding part of the signal waveform is already read out from another one of the buffers and is subjected to digital/analogue conversion and is transmitted in the relevant transmitting channel (10.1). wherein the OFDM symbols transmitted in a respective transmitting channel each have OFDM subcarriers which are orthogonal to the OFDM subcarriers (92, 94) of the OFDM symbols (82, 84) simultaneously transmitted in the other ones of the plurality of transmitting channels, wherein, for a reception signal received by the at least one receiving channel, signal components of the reception signal are spectrally separated, wherein OFDM subcarriers are divided among the signal components according to their division among the transmitting channels in the OFDM symbols (80, 82, 84) simultaneously transmitted in the transmitting channels, and the signal components are evaluated, characterized in that the OFDM radar sensor has, at least for first transmitting channels (10.1) of the plurality of transmitting channels, a plurality of buffers (18; 20) for each first transmitting channel (10.1) for parts of a signal waveform of the signal to be transmitted in the transmitting channel (10.1), wherein, in the operating mode mentioned, at least for the first transmitting channels (10.1), the signal waveform of the signal to be transmitted, which comprises the relevant sequence of OFDM symbols, is progressively calculated in parts for each transmitting channel (10.1), wherein the plurality of buffers (18; 20) are used alternately to store a calculated part of the signal waveform and to read out a previously calculated and stored preceding part of the signal waveform which is subjected to digital/analogue conversion and is transmitted, wherein a respective part of the signal waveform is calculated and is stored in one of the buffers, whereas a preceding part of the signal waveform is already read out from another one of the buffers and is subjected to digital/analogue conversion and is transmitted in the relevant transmitting channel (10.1).