Look Ahead Propagators

When used with the Real-time propagator, both the HoldCBIPosition and HoldCBFPosition propagators effectively keep the vehicle at the endpoint during the entire look ahead duration without projecting ahead or altering attitude. Velocity remains constant so that attitude will not be altered.

During the look ahead period, the reported velocity is not actually the time derivative of position.

Propagator	Description
HoldCBIFPosition	The HoldCBIPosition look ahead propagator keeps position and velocity constant in the inertial (i.e., CBI) frame.
HoldCBFPosition	The HoldCBFPosition look ahead propagator keeps position and velocity constant in the fixed (i.e., CBF) frame.