Device and method for method for calibrating a transmitter of a radar system

A radar system comprising:

• a plurality of transmitters;
• a transmitter calibrator configured to set a radar transmitter to be calibrated among the plurality of radar transmitters to a first Doppler Division Multiplexing pattern and associate each of the other transmitters of the plurality of transmitters with a respective second Doppler Division Multiplexing pattern such that it holds that
• the order of the first Doppler Division Multiplexing pattern divided by the product of the orders of the second Doppler Division Multiplexing patterns associated with the other transmitters of the plurality of transmitters is greater than two and
• the constellation points of the second Doppler Division Multiplexing patterns associated with the other transmitters of the plurality of transmitters are included in the first Doppler Division Multiplexing pattern;
• and
• an object detector configured to detect a target by performing radar detection with the plurality of transmitters, wherein the transmitter to be calibrated is operated with the first Doppler Division Multiplexing pattern and each of the other transmitters of the plurality of transmitters is operated with its associated second Doppler Division Multiplexing pattern;
• wherein the transmitter calibrator is configured to
• extract Doppler Fourier transform coefficients for a Doppler spectrum peak corresponding to the target and for spurs associated with the peak,
• apply an inverse discrete Fourier transform to the extracted Doppler Fourier transform coefficients,
• detect a phase error of the transmitter to be calibrated using a result of the inverse discrete Fourier transform, and
• calibrate the transmitter to be calibrated according to the detected phase error.