As we all know, the Sea of Japan, known as the "Seventh Fleet Anti-Submarine Brigade", has attached great importance to the development of surface ship anti-submarine capabilities since the end of World War II. Recently, the first active and passive composite towed sonar developed by the country, OQQ-25, was accidentally exposed by Japanese photographers stole photos of the "Asuka" test ship from the sea, and caused Japanese military enthusiasts on the Internet. High attention.
What needs to be mentioned here is that the active and passive composite towed sonar, in a general sense, is mainly composed of two different sonar systems, that is, the active deepening towed body (VDS) responsible for emitting sound waves. ), and the towed passive linear array responsible for receiving echoes. The bright yellow object we see is the active deepening towed body part of the active and passive composite towed sonar system being tested in Japan.
has the ability to send and receive at the same time, so the active and passive composite towed sonar such as OQQ-25 is much more useful than the simple towed passive linear array in detecting the new generation of quiet submarines. At the same time, its range is far beyond that of ordinary ship hull active and passive sonar. As far as the world is concerned, the major naval powers have invested a lot of energy in the development of active and passive composite towed sonar.
According to Haizi’s established plan, this Japan’s most advanced anti-submarine sonar will be equipped in batches for their new generation of frigates-30FFM after the test is completed on the Asuka. The picture shows a close-up of the stern of the 30FFM first-built ship undergoing block assembly at Yokohama Isogo Shipyard. The stern door on the left is the release/recovery port of the active towing body of the OQQ-25 active and passive composite towed sonar.
is precisely because this type of active and passive composite towed sonar has a qualitative leap in performance compared to previous underwater acoustic detection systems. Therefore, for the Sea of Japan, which has always attached great importance to anti-submarine missions, the future batch service of OQQ-25 must have extremely important significance. In this way, we can also understand why Japanese netizens are so excited when they see OQQ-25 is about to complete the test.
Of course, what many Japanese netizens don’t know is that the navy type 311 active and passive composite towed sonar is of the same type as the most advanced OQQ-25 in their eyes. It has been widely used on destroyers such as 054A, 052D, 055 and 056A, and the scale of installation is close to the 100-set mark. In terms of quantity alone, it has even surpassed the sum of other navies in the world.
