A radar unit comprising: a phased array radar system comprising a plurality of cascaded millimetre wave, mmW, transceiver, TRx, integrated circuits, ICs, configured to support a normal radar mode of operation that comprises transmitting a radar signal waveform and receiving an echo signal thereof, each mmW TRx IC comprising at least one phase shift circuit and each coupled to respective antennas; and a signal processor circuit operably coupled to the plurality of cascaded mmW TRx ICs and configured to process transmit and receive signals of the plurality of cascaded mmW TRx ICs; wherein the radar unit is characterized by : an auxiliary mmW TRxIC operably coupled to the signal processor circuit and comprising a first TRxIC and a second TRxIC , the first TRx IC of the auxiliary mmW TRx IC is configured to wirelessly transmit a signal to the second TRx IC of the auxiliary mmW TRx IC via a respective antenna; a localization processing circuit operably coupled to at least one of the first TRx IC and second TRx IC and configured to determine a distance relationship between at least one antenna coupled to the first TRx IC and at least one antenna coupled to the second TRx IC ; and a phase control unit , operably coupled to the localization processing circuit and configured to adjust the at least one phase shift circuit in response to the wirelessly determined distance relationship. a phased array radar system comprising a plurality of cascaded millimetre wave, mmW, transceiver, TRx, integrated circuits, ICs, configured to support a normal radar mode of operation that comprises transmitting a radar signal waveform and receiving an echo signal thereof, each mmW TRx IC comprising at least one phase shift circuit and each coupled to respective antennas; and a signal processor circuit operably coupled to the plurality of cascaded mmW TRx ICs and configured to process transmit and receive signals of the plurality of cascaded mmW TRx ICs; wherein the radar unit is characterized by : an auxiliary mmW TRxIC operably coupled to the signal processor circuit and comprising a first TRxIC and a second TRxIC , the first TRx IC of the auxiliary mmW TRx IC is configured to wirelessly transmit a signal to the second TRx IC of the auxiliary mmW TRx IC via a respective antenna; a localization processing circuit operably coupled to at least one of the first TRx IC and second TRx IC and configured to determine a distance relationship between at least one antenna coupled to the first TRx IC and at least one antenna coupled to the second TRx IC ; and a phase control unit , operably coupled to the localization processing circuit and configured to adjust the at least one phase shift circuit in response to the wirelessly determined distance relationship. an auxiliary mmW TRxIC operably coupled to the signal processor circuit and comprising a first TRxIC and a second TRxIC , the first TRx IC of the auxiliary mmW TRx IC is configured to wirelessly transmit a signal to the second TRx IC of the auxiliary mmW TRx IC via a respective antenna; a localization processing circuit operably coupled to at least one of the first TRx IC and second TRx IC and configured to determine a distance relationship between at least one antenna coupled to the first TRx IC and at least one antenna coupled to the second TRx IC ; and a phase control unit , operably coupled to the localization processing circuit and configured to adjust the at least one phase shift circuit in response to the wirelessly determined distance relationship. <EOS>