The Kalman filter: the noise-fighting idea you see everywhere once it clicks

A clean primer on why the Kalman filter turns up everywhere once it clicks — robots, drones, self-driving cars, sensor fusion, tracking, navigation, control systems. The setup is deceptively simple: your sensors are noisy. GPS isn't perfect, the IMU drifts, encoders slip. The filter fuses those messy, conflicting readings over time into a single best estimate of where a system actually is.

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