The problem then and now with the non US developments is that they do not have complete system autonomy - they're limited by the fact that all command and management is via umbilical - and that effects "effective" range. The second issue is autonomous payload - and is directly tied into the issue of range (search, sweep, duration issues)The German MJ2010 concept - 10 years ago, before it was trashed for cost reasons - planned the use of semi-autonomous "Sea Horse" USVs as combination minesweeper and minehunting drone carriers, with two or three of these USVs led and serviced by a manned platform, and these three or four ships sweeping and hunting as a pack similar to the Troika concept.
As for current development, the heavy "Sea Otter" UUV drone is envisaged to go in that direction with future payloads (sidescan sonar, possibly carrying destruction charges).
The US is focussed on having UDT used at the wireless level so that they can dramatically change the way that UUV/USV's can work. It invites the issues of arrays, fused search, swarm management etc... it means that the UUV/USVs can start to hot swap roles, shuffle persistence issues on station etc....
umbilical vehicles have significant restrictions.
The US does have some very nice MCM capability built into ROV's - but its a long way from a gold release of wireless capability. I was lucky enough to witness a demo of such capability in the US about 4 years ago, and they even had some proposals for cavitating weapons release via USV control..
everyone else is a generation behind what the US were doing even 4 years ago. (although the USN regards the AI in Australias Wayamba USV as something that they are striving for in future array/swarm capabilities.
There is however a reason why countries like australia are maintaining development of umbilical management. I did witness a demo of a USV off Hawai'i about 4 years ago - it had a duration of 8hrs. within 2-3 years it had tripled its duration. The problem however is that autonomy means a demand on efficient onboard power as well as engine management. the ratio of efficient systems to persistence is still a long way off. The US however is determined to get around that restriction.
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