Sample Dataset for Kalman Filter
You can easily create measurement for Kalman Filter model.
Just run the model itself on some noise with starting point and you'll have endless number of data points.

Namely, if your model is given by:

$$ x \left[ k \right] = F x \left[ k - 1 \right] + v \left[ k \right] $$

Then all you need is to generate $ x \left[ 0 \right] $ randomly according to $ P \left[ 0 \right] $ and start moving it according to the above model while generating $ v \left[ k \right] $.