Research on the Problem of Short-Range Obstacle Detection and Alarm Degradation of Automotive Ultrasonic Radar
Before the ultrasonic radar equipped with a model under development,there is an obstacle in the long sound area of radar detection,and the ultrasonic radar is started and it is found that the car does not send out a long sound alarm,but only sends out an intermittent sound alarm,and the alarm degradation is easy to cause the driver to misjudge the distance of the obstacle and cause a collision.Through the analysis of the obstacle detection alarm strategy and radar residual waveform of automobile radar,it is found that when the ultrasonic radar is not powered on and activated,some obstacles are located in the long sound area detected by the ultrasonic radar,and the overlap between the radar residual waveform and the obstacle echo is greater than the maximum effective aftershock L set by the ultrasonic radar(the maximum effective residual vibration value set by the radar after self-learning prevents the radar from detecting the trailer coupler and the ground and causing the car to beef).The long-honk alarm strategy requires that the distance between the radar of the car and the obstacle is not greater than L1,and the minimum obstacle distance output by the radar in the power-on cycle is L,and L is greater than L1,so that when the radar detects the obstacle in the long-ring area,the car cannot give the long-honking alarm.By adding the judgment logic,the maximum effective residual vibration of the ultrasonic radar is set to L' and L'=L1-1,which eliminates the overlap between the ultrasonic aftershock waveform and the obstacle echo,and effectively solves the problem of obstacle alarm degradation in the radar long-sounding area.
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