A Signal Processing Algorithm for Interference Suppression of Automotive Radar Using an Auxiliary Receiver

In this work, we propose an automotive radar system equipped with an add-on receiver (RX) capable of sensing and suppressing interference signals. The add-on RX is designed to filter out target signals, allowing only signals from interferers to exist in the add-on RX. By setting the add-on RX’s local oscillator (LO) frequency higher than the original RX’s LO, the intermediate frequency of the interference signals in the RXs occurs in two separate time zones, enabling their identification and cancelation in the time domain. In both RXs, burstlike interference signals are searched for, and their phase information is acquired through Hilbert transform. Subsequently, the interference signal identified in the add-on RX is phase- and time-shifted using a phase recovery and time-shifting algorithm. The compensated interference signal is then subtracted from the signal in the original RX, leaving only the target signals in the original RX. Simulation results show that the interference signal is successfully suppressed, and a hidden target signal is recovered.