  In order to operationalize the Australia Telescope Compact Array (ATCA) for
space situational awareness (SSA) applications, we develop a system model for
range and direction of arrival (DOA) estimation based on the interferometric
data. We employ the observational data collected from global positioning system
(GPS) satellites to evaluate the developed model and demonstrate that, compared
to a priori location propagated from the most recent two-line element (TLE),
both range and direction information are improved significantly.
