Easy to understand Kalman filter

There is a winding path on a piece of green grass, leading to a big tree. A request was made: walk along the path from the starting point to the tree. "It's easy." A said, so he walked along the path to the tree without any problems. Now, the difficulty has been increased: blindfolded. "It's not difficult, I have worked as a special soldier." B said, so he crookedly walked to the tree ………. "Oh, I have n't practiced for a long time, it's unfamiliar." "Look at me, I have a DIY GPS!" C said, so he walked up to the tree... like a drunkard. "Oh, this GPS software is not ready, the drift is too great." "I'll try it." The person next to him took the GPS, blindfolded, and walked down the path to the tree. "So amazing! Who are you?" "Kalman!" "Kalman?! Are you Kalman?" Everyone was shocked. "I mean this GPS card is slow."

Karl ,  filter ,  karl ,  filter

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