Measurement and Analysis of Narrowband Interference in Automotive CS radars and Impact on Interference Suppression Techniques

Narrowband interference causes false detection of the target when interference CS (Chirp sequence) radar has the same chirp rate as the measurement CS radar. Narrowband interference theoretically appears as line spectrum, however experimental results show that its spectrum is spread in ranging spectrum and its frequency changes according to time. This paper describes measurement and analysis of narrowband interference and shows how hardware imperfections cause frequency shift and spectrum spreading of narrowband interference. Furthermore, it discusses impact on narrowband interference suppression and proposes block-wise noise level estimation to improve narrowband interference suppression performance.