In this solution Helicoptor Fire Control System
CMA is used. For motion analysis we use computer vision and image processing. But what is special about CMA.
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From a quick skim of a few monographs and book excerpts (which, by the way, are easily found via web search -- something worth doing before posting a wide-open question), it appears that CMA is an active system - sonar or radar, for example, which provides a wealth of information on object range, size, and motion. Further, any active system can operate regardless of local illumination, as opposed to a vision system which shuts down after sunset (roughly speaking).