ngc_trn (autoNGC Terrain Relative Navigation Application)(GSC-19383-1)

Terrain relative navigation is a technique where observations of natural terrain using a camera is used to help navigate a spacecraft with respect to the observed terrain. In the autonomous navigation, guidance, and control system (autoNGC), this process is performed using ngc_trn, a core Flight System (cFS) application which uses cGIANT to perform surface feature based terrain relative navigation. ngc_trn acts as both an interface and command layer, by formatting and receiving/transmitting incoming and outgoing data, by setting up cGIANT, and by making the appropriate cGIANT calls.