GMAT provides and interface designed to read data from a source and import that data into internal data objects. This capability is currently under development.
The initial implementation will read an ASCII version of a TCOPS Vector Hold File used in the operation of the ACE spacecraft. This page describes the design for that implementation, and shows how it fits into the DataReader class structure. The design documented here discusses that class structure, and can be used as a starting point for the implementation of additional data readers in GMAT.