  In high-contrast space-based coronagraphs, one of the main limiting factors
for imaging the dimmest exoplanets is the time varying nature of the residual
starlight (speckles). Modern methods try to differentiate between the
intensities of starlight and other sources, but none incorporate models of
space-based systems which can take into account actuations of the deformable
mirrors. Instead, we propose formulating the estimation problem in terms of the
electric field while allowing for dithering of the deformable mirrors. Our
reduced-order approach is similar to intensity-based PCA (e.g. KLIP) although,
under certain assumptions, it requires a considerably lower number of modes of
the electric field. We illustrate this by a FALCO simulation of the WFIRST
hybrid Lyot coronagraph.
