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Probably wrong. Almost all modern detection/fire control radar systems use the doppler effect to filter out enemy contacts from noise. So unless you have sea waves travelling towards the ship at Mach 3, there would be absolutely no problem detecting an inbound missile. It wouldn’t matter if they were 0.1m or 100m above the sea, there is no way a modern radar will confuse a Mach 3 contact with sea waves.
A sea-skimming attack profile hides missiles behind the radar horizon (the missile physically hides behind the curvature of the earth) as long as possible. On an AEGIS-class destroyer/cruiser, that’s about 40-50 km depending on how high the detection/fire control radars are mounted and how low the BrahMos is flying.
Thus, factoring out “over-the-horizon” targeting, the target ship (or battle group) has about 40-50 km of range to detect and shoot down the incoming BrahMos missiles, which isn’t a lot of time consider how fast these missiles are (40-45 seconds at Mach [email protected] level).