Could be a radar or IRST-style [0] system, both are used for that kind of thing. I imagine there might be some design complications with something like IRST to

Could be a radar or IRST-style [0] system, both are used for that kind of thing. I imagine there might be some design complications with something like IRST to the extent they have to keep laser reflections from hitting the imager. [0] https://en.wikipedia.org/wiki/Infrared_search_and_track https://en.wikipedia.org/wiki/Infrared_search_and_track