Wei-Chen Li

Addresses [feature request 32](https://github.com/duncanlang/Letterboxd-Extras/issues/31)

From to

Extended Kalman filter and unscented Kalman filter

1

**Is your feature request related to a problem? Please describe.** The current [estimators](https://drake.mit.edu/doxygen_cxx/group__estimator__systems.html) in Drake, such as the `LuenbergerObserver`, is somewhat limited in scope. It would be nice to have...