I was thinking about how flats could be obtained by each system if they are to be operated remotely. With the cameras used in these systems there is the element of non-flatness that needs to be considered if we were to obtain flats using the traditional method of shooting the dusk sky. There is also the method of wrapping some kind of fabric over the opening of the unit so as to disperse the daylight, but this would require someone to be present each time.
So, I was thinking maybe a light source could be mounted to each unit. This light source would be either very diffuse or have some kind of diffusing element placed in front of it. I am imagining this could be controlled via some kind of addition to POCS. A flat surface or diffusing material could be permanently placed wherever the unit is faced while parked, with this acting as the surface of which the flat field is taken. I hope that makes some kind of sense. Please see the diagram below for potentially more clarity.
In the diagrams I show the potential orientation of the unit as well as four potential arrangements of the light sources, three being on the front of the unit itself and one being placed behind a diffusing material that is placed in front of the unit.
Please let me know what you think. Thanks!