The requirement for the system is undeniable, trawling the market place for existing or planned systems to do the job is sensible. I fear, however, like a number of projects for which I have recently managed requirements under a 'must be COTS' directive, the shelf may currently be bare of something that matches the bulk of requirements, and require a cooperative development pathway with a chosen supplier.
Anyway the relevant technologies have come a long way since it involved my old man and an oppo paddling a canoe round Trincomalee Harbour armed with a bucket of hand grenades trying to identify any intruding IJN minisubs with a sensor outfit consisting of four Mk1 eyeballs, four Mk 1 ears, and a pair of binoculars.
Anyway, I am off to continue reading Citadel of Waste.
https://www.pprune.org/military-aviation/656595-citadel-waste-david-hill.html