Mutual Interference Suppression Using Clipping and Weighted-Envelope Normalization for Automotive FMCW Radar Systems

Jung-Hwan CHOI  Han-Byul LEE  Ji-Won CHOI  Seong-Cheol KIM  

IEICE TRANSACTIONS on Communications   Vol.E99-B   No.1   pp.280-287
Publication Date: 2016/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2015EBP3152
Type of Manuscript: PAPER
Category: Sensing
frequency modulated continuous wave (FMCW),  77GHz,  radar,  interference,  suppression,  

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With extensive use of automotive radars, mutual interference between radars has become a crucial issue, since it increases the noise floor in the frequency domain triggering frequent false alarms and unsafe decision. This paper introduces a mathematical model for a frequency-modulated continuous-wave (FMCW) radar in interfering environments. In addition, this paper proposes a time-domain interference suppression method to provide anti-interference capability regardless of the signal-to-interference ratio. Numerical results are presented to verify the performance of a 77GHz FMCW radar systme with the proposed method in interference-rich environments.