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The need for increased maritime security has prompted research focus on intent recognition solutions for the naval domain. We consider the problem of  early classification of the hostile behavior of agents in a dynamic maritime domain  and propose our solution using multinomial hidden Markov models (HMMs). Our contribution stems from  a novel encoding of observable symbols as the rate of change  (instead of static values) for parameters relevant to the task, which enables the early classification of hostile behaviors, well before the behavior has been finalized. We discuss our implementation of a one-versus-all intent classifier using multinomial HMMs and present the performance of our system for three types of hostile behaviors (ram, herd, block) and a benign behavior.

Early Classification of Intent for Maritime Domains Using Multinomial Hidden Markov Models