  Intentional and unintentional interferences are an increasing threat for the
satellite communications industry. In this paper, we aim to localize an
interference with unknown location using frequency of arrival (FoA) technique
by only relying on the measurements obtained through a single satellite. In
each time instance, the satellite samples the interference and forwards it to
the gateway to estimate its frequency. Since the satellite moves, each
estimated frequency includes a Doppler shift, which is related to the location
of the unknown interferer. The satellite's position, velocity, oscillator
frequency, and the interference frequency are used at the gateway to build a
location-related equation between the estimated frequency and the location of
the unknown interference. Simultaneously with the interference signal, the
satellite samples a reference signal to calibrate the estimated frequency and
compensate for the mismatches between the available and real values of the
satellite's position, velocity, and oscillator frequency. Multiple
location-related equations obtained based on the FoA measurements, (at least
two), along with the equation of the earth surface are used to localize the
unknown interference. Simulations show that increasing the number of these
equations, and the satellite velocity can improve the localization accuracy by
80% and 95%, respectively.
