串口超声测距系统工作程序，0KHz超声收发头，超声波速度补偿，温度范围：0-60度-Serial ultrasonic ranging system procedures, 0KHz ultrasonic transceiver head, ultrasonic velocity compensation, the temperature range :0-60 degree

超声波，小车预碰撞，XS128程序，有测速、PID控制加速度，超声波测距，滑动加权滤波，去极值平均滤波，限幅滤波-Ultrasound, the car pre-crash, XS128 procedures, speed, PID control acceleration, ultrasonic ranging, sliding weighted filtering, extreme value averaging filter, limiting filtering