Monitoring the location of customer equipment is an important problem in the direct broadcasting sateMte indw try. This is because the service providers wotdd We to pr ent unauthorized movement of a customer's set top terminal (STT) from a home to a pubtic venue, or acro~an international border, due to tious kancid, copyright and po~ticd issues.
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Gabber et al. (1998) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: