INTERFERENCE MITIGATION IN AUTOMOTIVE RADAR SYSTEMS BY ARTIFICIAL DOPPLER MODULATION

摘要

A method of operating an automotive radar system (10) for avoiding interference by other radar systems is provided. The automotive radar system (10) includes a radar transmitter unit (12) for transmitting radar waveforms (x_Tx, x̃_Tx,) towards a scene, a radar receiving unit (16) for receiving radar waveforms (x_Rx,x̃_Rx) that have been reflected by a target (26, 28) in the scene, and an evaluation and control unit (20) for decoding range-Doppler information from the received radar waveforms (x_Rx,x̃_Rx). The method comprises steps of transmitting (32) a first sequence of radar waveforms (x_Tx ) and a second sequence of radar waveforms (x̃_Tx,k) towards the scene that differs from the first transmitted sequence of radar waveforms (x_Tx ) by predetermined phase shifts (φ_k) such that each radar waveform (x̃_Tx,k) of the second sequence has a different predetermined phase shift (φ_k). First range-Doppler information and second range-Doppler information are decoded (36). Deviations of the second range-Doppler information from the first range-Doppler information are compared (44) to at least one predetermined deviation value. Based on the results of the comparing, a potential interference condition is identified (46).