The invention discloses a method for determining the driving direction of a vehicle, and the method comprises the steps: firstly, collecting a vehicle noise signal through a sound recorder, setting time windows, and calculating the average noise power of the vehicle in each time window; then, selecting the maximum average noise power and the minimum average noise power, dividing the average noise power into a plurality of grades according to a mode of sequentially and linearly increasing from the minimum average noise power to the maximum average noise power, and calculating the average noise power of each grade; selecting low-order and high-order observation average noise measurement power, and respectively determining starting and ending moments of the low-order and high-order observation average noise measurement power according to the vehicle average noise power sequence diagram; calculating a starting time difference between the high-order and low-order observation average noise measurement power and an ending time difference between the low-order and high-order observation average noise measurement power; and finally, judging the driving direction of the vehicle according to the angle direction from the microphone direction of the sound recorder to the inner normal of the outer traffic lane adjacent to the sound recorder, the starting time difference of the high-order and low-order observation average noise measurement power and the ending time difference of the low-order and high-order observation average noise measurement power. The driving direction can be determined by collecting vehicle noise through a single sound recorder, and calculation is simple and is not affected by weather visibility.
本发明公开了一种确定车辆行驶方向的方法,首先,利用声音记录仪采集车辆噪声信号,设置时间窗口并计算各时间窗口内车辆的平均噪声功率;然后,选取最大平均噪声功率和最小平均噪声功率,按照从最小平均噪声功率到最大平均噪声功率依次线性增加的方式将平均噪声功率划分为多个等级,计算各级平均噪声功率;选择低阶和高阶观测平均噪声衡量功率,根据车辆平均噪声功率时序图分别确定低阶、高阶观测平均噪声衡量功率开始和结束时刻,并计算高阶与低阶观测平均噪声衡量功率的开始时间差、低阶与高阶观测平均噪声衡量功率的结束时间差;最后,根据声音记录仪的麦克风方向到声音记录仪近邻的外行车道内法线的角度方向、高阶与低阶观测平均噪声衡量功率的开始时间差、低阶与高阶观测平均噪声衡量功率的结束时间差判断车辆行驶方向。通过单个声音记录仪采集车辆噪声即可确定行驶方向,计算简单,不受天气能见度影响。
Method for determining driving direction of vehicle
一种确定车辆行驶方向的方法
2024-08-09
Patent
Electronic Resource
Chinese
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