说明：  雷达测量远处山峰距离，来滤除参测观测过程的噪声问题，雷达位置为（0，0），山峰位置为（5000，0），两者距离5000m，通过一阶卡尔曼滤波器来进行观测。
(The radar measures the distance between the remote peaks to filter out the noise in the observation process. The radar position is (0,0) and the peak position is (5000,0). The distance between the two is 5000m, and the observation is carried out through the first-order Kalman filter.)