If a drone is flying at 10km high, it can only see 357km before the horizon blocks its sight.
The Carrier's AEW in service (E2-Hawkeye) is allegedly able to detect threats up to 550km or so away. (remember: the Hawkeye is also in the air, so it will be peaking out of the horizon long before the carrier is visible)
The escort cruisers allegedly have Raytheon AN/SPS-49, which apparently have 474 km range vs air enemies (other radars / sonars exist for sea). Either way, if the drone can see the Cruiser, the cruiser probably can see the drone. Furthermore, AEGIS cruisers are literally the "shields" of the carrier: deployed in front to kill targets before they detect the carrier. So likely: you're not detecting the carrier first. The first things you detect are the AEGIS escort ships. Nominally, these radar systems are for missile tracking, but they will serve as eyes/ears for the strike group if a squadron of drones is approaching.
The one-two punch of the aerial radar (Hawkeye) + sea-based radar (Ticonderoga AEGIS cruisers) means that its no small feat to "sneak up" upon the carrier strike group.
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How long does it take for your drone to travel from 550km away to ~300km, during which it is under threat from at minimum, the escort cruiser? Maybe an airwing or two who could scramble a counter-attack? Its not like your drone is flying straight at the carrier either (you still haven't found the carrier: you only found an escort cruiser. The carrier is likely over the horizon still).
> if your method of evading detection is destroying all available hostile sensor platforms, stealth is superfluous.
Yeah, that's the idea for a Carrier's defenses anyway. The CSG has not only incredible airborne radar systems (E2-Hawkeye), but also incredible ship-based radar systems scanning for this sort of stuff.
That's why stealth aircraft (like F35) are so key for future wars. That's the only way to penetrate the radar coverage. Things like autonomous drones have a control signal that can be tracked, while F35 manned aircraft could go radio silent on their stealth approach (relying upon the human brain in the aircraft to make decisions without any connection to homebase).
Unmanned + Stealth is possible, but its a difficult kind of paradox. A lot of decisions need to be made during radio-silence periods.
You want to win at the sensor war. Detect the enemy before they detect you. Then destroy the enemy's eyes and ears.
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And then the AEGIS radar systems are also deployed on each Destroyer in the strike group (4 to 9 Destroyers deployed per CSG). That's a lot of sensors your drone squadron has to fly around to successfully find a carrier.