These are caused by noise in the reference read that manifest as correlated noise in all of the resultants downlinked from the telescope (all of which have the reference read subtracted). The implementation is via adding a configurable amount of random noise to each pixel.
Issue RCAL-871 was created on JIRA by Eddie Schlafly:
Add frame zero effects to the simulator.
These are caused by noise in the reference read that manifest as correlated noise in all of the resultants downlinked from the telescope (all of which have the reference read subtracted). The implementation is via adding a configurable amount of random noise to each pixel.