Research On Collision Avoidance System Scheme Of Signalized Intersection

Signal control intersection as a key node of urban road network,the traffic characteristics is complex,not only traffic congestion points,but also traffic accidents point.Vehicle forewarning technology has impact on driver risk perception and driving decision.Therefore,it is of great significance to study the influence of the forwarning technology on the driver's information perception and decision-making,and improve the traffic intersection safety.Signal Intersection Collision Avoidance System(ICAS): Signalized Left Turn Assist improve the safety of left turn vehicles without changing the signal phase and provide the driver with collision warning.By analyzing the phenomenon of traffic conflict and the severity of potential conflict,we select the conflict of the left turn between straight flow at two-phase signal intersection.In this paper,we first study the left-turn vehicles entering the intersection,and use the simple algorithm of vehicle kinematics to detect the left-turn events.When the vehicle enters the intersection,we use the SQL database language to filter,and then calculate yaw rate and the yaw angle of the left-turn vehicle,and the error correction.The extended Kalman filter algorithm is used to estimate the vehicle motion state.According to the vehicle movement information,the relative distance and the target point on the trajectory of the straight train are obtained,and then optimized and the fuzzy analysis the target point,and connect the points to obtain the estimated trajectory of the straight train,the traffic collision detection model is established.The model of the conflict detection model is analyzed to verify the validity of the model.Designed the signal intersection collision avoidance system: signalized left turn assist(ICAS),the system is divided into vehicle and intersection module.the rational installation of the system vehicle detector and turn left to remind the system.The design of the system is divided into vehicle and intersection module,the communication between the two through the DSRC(Dedicated Short Range Communications)to send and receive vehicle sensor data.Through vehicle radar,GPS,camera and other vehicle detectors to obtain vehicle movement information.Combined with the vehicle movement at the intersection to improve PET calculation,provide conflict judgment,forwarning level division.Through light-emitting diodes combined with voice prompts to release forewarning.