通过计算方差，确定划分坐标轴，最后，将点云划分到一个个格子中，这样的好处在于可以将噪点和有效点分别存储于不同的格子中，方便进行去噪。(k-d tree create;By calculating the variance, the coordinate axis is determined. Finally, the point cloud is divided into a number of lattices. The advant

船舶pid控制 改变kp ki kd 得到适合的控制效果(Ship pid control changes KP ki kd to get suitable control effect)

A program that repeats turning on and off