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need helps about Kalman filter
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Hello everyone. I used measurement position to estimate velocity by Kalman filter. But in simulation, Kalman gain change quickly and then remain constant when position and velocity continue to change (for example, position and velocity change in 0->0.5(s) and 3->4(s). But Kalman gain only change only 0->0.1(s)and then remain constant). My question is why Kalman gain is still constant when postion and velocity change? Sorry for my bad English.
John Petersen on 23 Jul 2014
The Kalman gain is not a function of the states. It is only a function of the covariances and the model of the system and measurements. If the system model is unchanging and the covariances converge, then the gains may also converge.