Ascertainment of calibration data to take temperature and voltage dependency of the hf radar signal phases in a radar system into consideration

A method comprising:

• providing a local oscillator signal in a first radar chip based on a local oscillator signal generated in a further radar chip;
• supplying the local oscillator signal to a reception mixer of a reception channel of the first radar chip that mixes an HF input signal down based on the local oscillator signal into a baseband, and generates a baseband signal, wherein an HF test signal that is based on the local oscillator signal is fed in as the HF input signal;
• changing one or more of a temperature of the first radar chip or a supply voltage of the first radar chip;
• measuring phase values based on the baseband signal for one or more of different temperature values of the first radar chip or different supply voltage values of the first radar chip;
• and
• ascertaining calibration data based on the measured phase values for a phase calibration to compensate for changes in a phase of the local oscillator signal supplied to the reception channel resulting from one or more of a change in the temperature or a change in the supply voltage.

A radar system, comprising:

• a transmission channel of a first radar chip that is configured to generate an HF output signal based on a local oscillator signal supplied to the transmission channel;
• a phase measurement circuit that is configured to measure phase values for one or more of different temperature values of the first radar chip or different supply voltage values of the first radar chip based on the local oscillator signal supplied to the transmission channel of the first radar chip and based on a corresponding HF output signal;
• and
• a computing unit that is configured to ascertain calibration data based on the measured phase values for a phase calibration for compensating for changes in the phase of the HF output signal resulting from a change in one or more of a temperature of the first radar chip or a supply voltage of the first radar chip.