The tools in this area are obsSim and orbSim. obsSim has many sources available to it, some of which are described below.
(15 Oct 2004) Sources available to obsSim is a set of example XML definitions of sources. Seth Digel
(20 Oct 2004) orbSim is a simple interface to the pointing mode options that are calculated in the GPS class of the astro. As far as I can tell, the comments in astro/GPS.h are the only documentation of these various pointing modes.