US 12,461,195 B2
Near-range interference mitigation for automotive radar system
Filip Alexandru Rosu, Bucharest (RO); and Ryan Haoyun Wu, San Jose, CA (US)
Assigned to NXP B.V., Eindhoven (NL)
Filed by NXP B.V., Eindhoven (NL)
Filed on Dec. 7, 2022, as Appl. No. 18/062,618.
Claims priority of application No. a 2022 00578 (RO), filed on Sep. 22, 2022.
Prior Publication US 2024/0111020 A1, Apr. 4, 2024
Int. Cl. G01S 7/35 (2006.01); G01S 13/931 (2020.01)
CPC G01S 7/354 (2013.01) [G01S 7/356 (2021.05); G01S 13/931 (2013.01); G01S 2013/93275 (2020.01)] 20 Claims
OG exemplary drawing
 
1. An automotive radar system, comprising:
at least one transmitter and at least one receiver, wherein the at least one transmitter and the at least one receiver are configured to transmit and receive radar signals, wherein the at least one transmitter and the at least one receiver are coupled to a vehicle; and
an automotive radar processor configured to:
receiving, from the at least one receiver, a received radar signal;
convert the received radar signal into an input signal range profile, wherein the input signal range profile includes near-range interference signals generated by reflections from a bumper of the vehicle and system component spill-over effects;
determine a reference signal;
convert the reference signal into a reference signal range profile by:
applying a tapering window to the reference signal to generate a tapered reference signal; and
applying a matched filter to the tapered reference signal to generate the reference signal range profile;
execute a recursive least squares operation to determine coefficient values of a finite impulse response (FIR) filter, wherein the coefficient values are selected to minimize an error between the input signal range profile and the reference signal range profile when the reference signal range profile is filtered through the FIR filter;
apply the FIR filter with the coefficient values to the reference signal range profile to determine a filtered reference signal range profile; and
subtract the filtered reference signal range profile from the input signal range profile to remove the near-range interference signals from the input signal range profile.