Multi-ball and one-ball geolocation
2017
We present analysis methods that may be used to geolocate emitters using one or more moving receivers. While
some of the methods we present may apply to a broader class of signals, our primary interest is locating and
tracking ships from short pulsed transmissions, such as the maritime Automatic Identification System (AIS.)
The AIS signal is difficult to process and track since the pulse duration is only 25 milliseconds, and the pulses
may only be transmitted every six to ten seconds. In this article, we address several problems including accurate
TDOA and FDOA estimation methods that do not require searching a two dimensional surface such as the
cross-ambiguity surface. As an example, we apply these methods to identify and process AIS pulses from a
single emitter, making it possible to geolocate the AIS signal using a single moving receiver.
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