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).