The most likely combat system Australia will choose:
Australia is very accustomed to the AN/BYG-1 and the US and Australia are constantly refining it. The AN/BYG-1 is apparently used on all US SSNs (Seawolf Class with AN/BYG-2 upgrade) and SSGNs as well as SSKs from:
Brazil (Tupi Class (Type 209))
Canada (Victoria Class)
The AN/BYG-1 is designed to work closely with the SeaWeb surveillance system. For possible positions of the SeaWeb as it covers East Asia see Submarine Matter's How to Trap the Chinese Dragon - SeaWeb's Fixed Undersea Array, September 4, 2015.
SOURCES POINTING AT PREFERENCE FOR US
See http://gentleseas.blogspot.com.au/2013/05/a-new-australian-submarine-with-aip.html In October 2009 Australia's then Minister of Defence Material Greg Combet, speaking still current RAN views, indicated that the US would play a big part in developing Australia's future submarine. The Sydney Morning Herald recorded what Mr Combet said on October 6, 2009. http://news.smh.com.au/breaking-news-national/us-to-play-key-role-in-new-aussie-subs-20091006-gky2.html: "US 'to play key role' in new Aussie subs" October 6, 2009...
"...I expect that Australia will look to learn from companies like General Dynamics Electric Boat and Lockheed Martin in designing and developing the Collins class replacement," he said in a statement.
"...US technology is likely to be an important facilitator of this capability," he said.
See http://gentleseas.blogspot.com.au/2012/06/australias-future-submarine-selection-s.html of 20 January 2014 - Prime Minister, Minister for Defence and Minister for Defence Materiel – Joint Media Release – 2013 Defence White Paper: The Future Submarine Program 3 May 2013 http://www.minister.defence.gov.au/2013/05/03/prime-minister-minister-for-defence-and-minister-for-defence-materiel-joint-media-release-2013-defence-white-paper-the-future-submarine-program-2/
- Some 2011 US RAND Corporation studies http://www.rand.org/topics/submarines.html concerning Australian submarine issues needs to be added.
An excellent source on Combat Systems generally and by system-maker is Norman Friedman The Naval Institute Guide to World Naval Weapon Systems 5th edn, 2006, pp. 133-156, text online
Germany's TKMS-HDW also has experience in integrating the AN/BYG-1 with Brazil's Type 209 submarines to take the US Mark 48 torpedo and US Harpoon missile. Therefore HDW should have no problem integrating AN/BYG-1. German designed submarines are compatible with the US submarine Harpoon missile in several countries (South Korea (in Australia’s region) Greece, Turkey, and Israel).
Other Combat Systems less likely to be chosen:
The ISUS 90 is on many of HDW's all export Type 209 and 214 submarines
On export markets, it is selected to equip every new submarines of Agosta, Scorpene and Andrasta types and to modernize submarines such as the Type 209.
- Submarines are increasingly faced with various missions including littoral and blue-water operations, stand-alone missions or within a naval force. SUBTICS indicates it can offer:
- Efficient acoustic sensors including low frequency arrays and scalable data processing offering outstanding detection abilities of distant targets at high speed;
- Efficient non acoustic sensors on the surface and at periscope depth offering a high level of discretion;
- Communication facilities (from VLF to SHF), noiseless and fully integrated allowing submarine to interact in real time within a force;
- Data synthesis from every sensors (optical, optronic, R-ESM and C-ESM, radar);
- Advanced, automatic and interactive target motion analysis Tracks identification and classification functionality;
- Track fusion and association through an interactive track management tool;
- Tactical, command and engagement aids with regard to geographical and tactical environment
- Tactical Data Links operation; and
- Fire and weapon control Torpedoes : F17, SUT 266, TP617, Black Shark, F21 Missiles : SM39 and land-attack capability
- Brazil (4 Scorpene being built) 1 SSN (to be built)
- Chile (2 Scorpene, 2 Type 209)
- Ecuador (2 Type 209)
- India, (in the 4 Type 209 “Shishumar” class?)
- Malaysia (2 Scorpene)
- Pakistan (Agosta 90B, Khalid Classes),
- Singapore (4 Challenger, 2 Archer Class) Type 218SG will not be using the French SUBTICS - instead using an Atlas Elektronik and ST Electronics designed system.
- Venezuela (2 unserviceable Type 209)
Australia is very accustomed to the US AN/BYG-1 and several conventional submarine companies have experience in integrating the AN/BYG-1 with conventional submarines. Also the US is Australia's most important ally.
The extent that Japan may also draw on US combat system technology is unknown but an indicator Japan may use something like the US combat sytstem comes from the weapons the Soryu is known to use. The Soryu uses a heavy weight torpedo thought to be very similar to the Mark 48 used by the US and Australia. The Soryu uses the US Harpoon short-medium range cruise missile and Japan is probably in early talks with the US concerning the longer range Tomahawk cruise missile (a missile Australia also wishes to acquire).