Method, device, and system for identifying that a first radar unit is subject to interference from a second radar unit

A radar unit generating a frequency-modulated continuous-wave, FMCW, and comprising circuitry configured to perform to identify that its FCMW is subject to parallel incoherent interference from a second radar unit generating a second FMCW, comprising:

• a receiver for acquiring a range-Doppler map corresponding to a time frame in which the radar unit was activated to transmit and receive signals, wherein the range-Doppler map includes signal values for a plurality of range intervals and a plurality of Doppler shifts,
• a processor for calculating a range-resolved signal for a negative half and a positive half of the range-Doppler map, wherein the negative half and the positive half of the range-Doppler map correspond to negative and positive Doppler shifts, respectively,
• the processor calculating a range-dependent noise profile for the range-Doppler map as, for each range interval, the smaller of the range-resolved signal for the negative half and the positive half, and identifying parallel incoherent interference in the range-Doppler map if:
• a measure of a deviation between the range-resolved signal for the negative half and the positive half is smaller than a predetermined deviation threshold, and
• a measure of a difference between the range-dependent noise profile and a global noise floor of the range-Doppler map exceeds a predetermined noise threshold.

A non-transitory computer-readable medium having computer code instructions stored thereon adapted to carry out a method for identifying that a first radar unit of frequency-modulated continuous-wave, FMCW, type is subject to parallel incoherent interference from a second radar unit of FMCW type, the method executed by a device having processing capability, the method comprising:

• acquiring a range-Doppler map corresponding to a time frame in which the radar unit was activated to transmit and receive signals, wherein the range-Doppler map includes signal values for a plurality of range intervals and a plurality of Doppler shifts,
• calculating a range-resolved signal for a negative half and a positive half of the range-Doppler map, wherein the negative half and the positive half of the range-Doppler map correspond to negative and positive Doppler shifts, respectively,
• calculating a range-dependent noise profile for the range-Doppler map as, for each range interval, the smaller of the range-resolved signal for the negative half and the positive half,
• identifying parallel incoherent interference in the range-Doppler map if:
• a measure of a deviation between the range-resolved signal for the negative half and the positive half is smaller than a predetermined deviation threshold, and
• a measure of a difference between the range-dependent noise profile and a global noise floor of the range-Doppler map exceeds a predetermined noise threshold.