基于回波探测的汽车防撞系统智能测距方法

在智能汽车防撞系统设计中，采用回波探测方法进行智能测距是避免汽车碰撞，实现主动制动的关键技术。传统方法采用局部传感器节点量化跟踪方法进行汽车测距，随着车辆速度和停等频率的增大，测距准确性下降。提出一种基于二次谐波线性调频信号回波探测的汽车防撞系统智能测距方法。首先分析了汽车智能防撞系统的回波探测测距原理，汽车在行驶过程中受到电磁场等脉冲信号的干扰，设计IIR自适应滤波器，进行干扰抑制，提取回波信号的冲激响应特征实现智能测距。仿真结果表明，该方法进行汽车防撞测距，具有较好的距离估计精度，受到干扰影响较小，测距精度较高，能有效应用在智能汽车防撞系统中。

Intelligent ranging method of vehicle anti collision system based on echo detection

In the design of intelligent vehicle collision avoidance system ,the intelligent distance measurement is the key technology to avoid the collision of the vehicle and avoid the collision of the vehicle .In the traditional method ,the local sensor nodes are used to quantify the tracking method ,and the accuracy of the measurement is decreased with the increase of vehicle speed and stop .An intelligent ranging method based on the two time harmonic linear frequency modulated signal detection is proposed .Firstly ,the echo detecting and ranging principle is analyzed .And then ,the IIR adaptive filter is designed ,and the impulse response of the echo signal is realized .The simulation results show that the method has better accuracy and less influence on distance estimation ,and can be used in intelligent vehicle collision avoidance system .