PLAN Littoral ASW Capability

Discussion in 'Navy' started by shen, Jan 3, 2014.

  1. AndrewS
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    AndrewS Senior Member
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    Yes, there are countermeasures.

    But how does a torpedo hide cavitation bubbles and propellor noise? Remember that it has to be traveling at high speed to catch up with a surface ship.

    Mines are more difficult, but remember a LIDAR only costs 8M USD. You can have a lot of them on cheap platforms
     
  2. gelgoog
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    gelgoog Junior Member
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    Even way back when they used compressed air torpedos. Those are quite silent. You can also use electric torpedos. Also there is no reason why you could not use pump jet propulsion with a torpedo and add an hydrophobic coating to it.
     
  3. Anlsvrthng
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    Anlsvrthng Junior Member
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    Compressed air gives very bad performance, 250 kj/kg ( maybe 300) , lithium battery gives bit better, 500 kj/kg, Otto monopropellant gives 2.5 MJ/kg.

    So, a compressed air torpedo can not hit a nuclear submarine, it is too slow for that.
    Electric torpedo can hit same slow moving ship, but against fast moving targets only the otto is the solution.
     
  4. Hendrik_2000
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    Hendrik_2000 Brigadier

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    It got pennant number so induction in the active service is not far away
    Via LKj 86
    1 down and 2 more to go
    [​IMG]
     
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  5. Hendrik_2000
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    Hendrik_2000 Brigadier

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    780 & 782
    I am looking forward for both ship commissioning, those 2 ship using ultra low frequencies can detect Sub as far away as 700 mile
    [​IMG]

    [​IMG]
     
    #345 Hendrik_2000, Jan 29, 2019
    Last edited: Jan 29, 2019
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  6. Hendrik_2000
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    Hendrik_2000 Brigadier

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    This is important news the UWGW is now in operation. Uplink to Beidou is working smoothly
    Chinese scientists have updated 20 underwater buoys, a real-time observation network in the western Pacific, and tested the transfer of data from 6000 meters deep via the Beidou constellation. .

    [​IMG]
     
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  7. Hendrik_2000
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    Hendrik_2000 Brigadier

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    Researchers also carried out successful experiments on real-time transmission of deep-sea data of 10,000-meter depth in the Pacific Ocean's Mariana Trench, laying the technical foundation for achieving further depth.
    China Focus: BeiDou achieves real-time transmission of deep-sea data Now what kind of data is this? Isn't Mariana trench close to Guam?

    Source: Xinhua | 2019-02-01 18:22:52 | Editor: Yamei
    Via LKJ 86

    QINGDAO, Feb. 1 (Xinhua) -- China has achieved real-time transmission of deep-sea data at 6,000-meter depth through its self-developed BeiDou satellites for the first time, a move essential to more secure, independent and reliable deep-sea data transmission.

    China's most sophisticated research vessel Kexue (Science) returned to the eastern port city of Qingdao on Thursday after wrapping up a 74-day, 12,000-nautical mile expedition. During the trip, Chinese scientists maintained and upgraded the country's scientific observation network in the West Pacific, according to the Institute of Oceanology under the Chinese Academy of Sciences (CAS).

    Researchers replaced batteries on 20 sets of submersible buoys on the network, optimized their positions and installed BeiDou satellite communication modules in them.


    As the low-volume submersible buoys powered by batteries can only be retrieved once a year, the communication modules were designed to be tiny, power saving and run steadily.

    "The data collected by the submersible buoys, including the temperature, salinity, flowing speed and direction of seawater, should be transmitted back to the ground lab by satellites. The amount of data was huge," said Wang Jianing, a researcher at the institute. So they developed multi-module communication and transmission technology, greatly lifting transmission efficiency.

    The breakthrough research vessel Kexue made changed the situation. Before, real-time observation of marine data had relied on foreign remote sensing satellites. Now there was improved data transmission security and reliability, according to Wang Fan, director of the Institute.

    China began to establish the real-time scientific observation network in the West Pacific in 2014, and realized real-time transmission of deep-sea data in 6,000-meter depth in this expedition, with the depth range extending from 1,000 meters in 2016 to 3,000 meters in 2017.

    Researchers also carried out successful experiments on real-time transmission of deep-sea data of 10,000-meter depth in the Pacific Ocean's Mariana Trench, laying the technical foundation for achieving further depth.

    There are 20 sets of submersible buoys, four sets of large floating buoys and some pieces of on-board mobile observation equipment in China's observation network for scientific research over the tropical West Pacific, which has acquired deep-sea data for five consecutive years. Wang said the data could enhance the precision in ocean climate and environment forecasts.

    The tropical West Pacific is home to the world's most sophisticated waters, with the strongest interchange of energy and materials between earth and the ocean.

    It has a close connection with the occurrence of El Nino and its duration, which has a significant influence on floods and droughts in China. And the El Nino weather phenomenon, characterized by a warming in the Pacific Ocean, has a profound impact on extreme weather conditions, according to the institute.

    With a tonnage of 4,711 tonnes, Kexue is 99.8 meters long and 17.8 meters wide, with a cruising capacity of 15,000 nautical miles.

    Kexue started its first expedition in April 2014 and has fulfilled several missions in the West Pacific Ocean and the South China Sea, with a more than 250-day voyage every year.

    China's BeiDou navigation system started to provide global services in December 2018.

    Source:http://www.xinhuanet.com/english/2019-02/01/c_137792605.htm
     
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