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Failing to get my Kalman filter to work, I've stripped it down to a very simple filter, and still can't get it to work.
The true motion of the target is \$x=10t\$, \$y=0.1\$. The filter state is \$[x, y, vx, vy]\$, and the measurement is simply \$zmeas = [xm, ym]\$, where these have some added G...