Research on Two-level Fusion Strategy of Unmanned Driving Perception Information Target-decision under Tunnel Environments
Based on the special driving environment in the tunnel and the perception requirements of unmanned driving,appropriate sensors and hardware were chosen to build a test vehicle and a per-ception system of multi-sensor fusion of millimeter-wave radar and camera.A two-level information fusion algorithm of"target-decision"was proposed based on YOLOv4 target-level information fusion algorithm and improved D-S evidence theory.Finally,a verification test of perception information two-level fusion was carried out in the urban road tunnel environments.The results show that in the tunnel environments,compared with the single camera or the millimeter-wave radar sensing results,the target-level fusion result based on the association of the camera and the millimeter-wave radar sen-sor to perceive the ROI area may improve the recognition accuracy by 9.51%,making up for the shortcomings of a single sensor in the tunnel environment perception technology.Based on the target-level fusion perception results,using the improved D-S evidence theory algorithm to perform decision-level fusion,compared with the single target-level fusion results,the false detection rate is reduced by 3.61%,which significantly improves detection accuracy.By adopting the multi-sensor sensing infor-mation target-decision-making two-level fusion strategy,it may meet the reliable sensing require-ments of unmanned vehicles in the special tunnel environments,and provide theoretical and technical support for promoting the applications of unmanned controlled technology.