Interference Suppression Performance of Automotive UWB Radars Using Pseudo Random Sequences

• Published in: Radioengineering
• Main Author: Pasya I.; Kato H.; Kobayashi T.
• Format: Article
• Language: English
• Published: Czech Technical University 2015
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84951113088&doi=10.13164%2fre.2015.0932&partnerID=40&md5=fd6e36430ffaf0f9daf8dd0954542910

Ultra wideband (UWB) automotive radars have attracted attention from the viewpoint of reducing traffic accidents. The performance of automotive radars may be degraded by interference from nearby radars using the same frequency. In this study, a scenario where two cars pass each other on a road was considered. Considering the utilization of cross-polarization, the desired-to-undesired signal power ratio (DUR) was found to vary approximately from -10 to 30 dB. Different pseudo random sequences were employed for spectrum spreading the different radar signals to mitigate the interference effects. This paper evaluates the interference suppression provided by maximum length sequence (MLS) and Gold sequence (GS) through numerical simulations of the radar's performance in terms of probability of false alarm and probability of detection. It was found that MLS and GS yielded nearly the same performance when the DUR is -10 dB (worst case); for example when fixing the probability of false alarm to 10-4, the probabilities of detection were 0.964 and 0.946 respectively. The GS are more advantageous than MLS due to larger number of different sequences having the same length in GS than in MLS.