China's naval capabilities are undergoing a notable evolution with the introduction of the Fujian, its latest aircraft carrier, reportedly set to feature an innovative anti-torpedo defense system. As China's ambitions extend further into blue-water operations, this addition underscores the persistent threat posed by advanced submarine technology, particularly from the United States.
This month, the South China Morning Post revealed that the Fujian could be the world's first carrier equipped with an active anti-torpedo torpedo (ATT) system. Such a technology represents a critical development for China, enhancing its capability to defend against sophisticated Western submarine threats.
Characterized by a six-tube, 324-millimeter lightweight torpedo launcher, the Fujian's system replaces older depth charge launchers seen on previous models. This upgrade signifies a strategic pivot, focusing on counteracting the "severe threat" posed by U.S. Navy submarines, particularly the Seawolf-class and the forthcoming SSN(X) attack submarines that are known for their potent torpedo systems.
The ATT system is engineered with advanced features, including a broadband sonar array that can effectively discern between actual threats and decoys. Furthermore, its high-torque permanent-magnet pump-jet thruster enables rapid acceleration to velocities between 50 and 60 knots in just three seconds, a vital attribute for targeting fast-moving torpedoes.
By employing directional shaped charges and overpressure shockwaves, the system is intended to ensure effective hits against threats. Future enhancements may even allow for supercavitation capabilities that could push defense speeds up to 200 knots, significantly bolstering the carrier's defensive posture against close-range underwater attacks.
This development reflects China's broader strategy to offset persistent deficiencies in anti-submarine warfare (ASW) capabilities within the People's Liberation Army Navy (PLAN). Historically, China’s aircraft carriers have operated relatively close to its shores, relying heavily on land-based air and missile support, which contrasts sharply with the UN Navy's operational flexibility and broader strategic reach.
As noted by military analysts, including Steve Balestrieri, while PLA Navy's assets can launch long-range strikes against enemy carriers, their own carriers remain vulnerable. For instance, U.S. Virginia-class submarines possess the capability to launch Mk48 heavyweight torpedoes and Maritime Strike Tomahawk missiles that pose significant risks to Chinese naval operations.
The limitations of China's ASW—especially in airborne operations—further compound vulnerabilities. A study by Eli Tirk and Daniel Salisbury highlights inadequacies in China's fixed-wing maritime patrol aircraft, coupled with insufficient training and proficiency among operators, which restricts effective ASW capabilities.
Systemic weaknesses in China's maritime domain, including a lack of advanced meteorological and oceanographic intelligence, hinder the PLAN's operational reach and effectiveness. These impediments are underscored by a limited logistic capability and challenges in coordinating responses to underwater threats.
While the PLAN has surpassed the U.S. Navy in sheer fleet size, American submarines still maintain a competitive edge in stealth capabilities. Andrew Erickson from the U.S.-China Economic and Security Review Commission notes that China's second-generation nuclear submarines exhibit significant acoustic signatures, rendering them louder than U.S. counterparts, thus compromising their effectiveness in covert operations.
Nevertheless, ongoing enhancements in submarine technology have led to notable strides in reducing noise levels within Chinese platforms. Innovations in machinery and technology—including reverse-engineered Russian designs—signal progress that aims to bring China's capabilities closer to international standards.
Moreover, the U.S. Navy is actively conducting operations within China's near seas. A report from the South China Sea Strategic Situation Probing Initiative indicates that, in a recent year, numerous U.S. nuclear-powered submarines were deployed in the South China Sea, further complicating the security environment for Chinese naval planners.
As China looks towards developing its nuclear-powered aircraft carriers, projected to function with greater distance from shore support, an emphasis will be placed on organic layered defense systems. This shift in operational doctrine necessitates a comprehensive approach to integrating sensors, escort ships, and command networks effectively.
According to Daniel Rice in a CMSI report, the PLAN's defensive strategy is categorized into three concentric defensive zones surrounding carrier strike groups. These include the Depth Defense Zone, which covers long-range air threats, the Middle Area Defense Zone utilizing surface ships, and the Point Defense Zone that employs terminal defense measures.
The Fujian's ATT system, positioned within this framework, might substantially enhance the capabilities of the Point Defense Zone, serving as a critical element in safeguarding the carrier from underwater threats.
Ultimately, while the introduction of the ATT system is significant, the pivotal question will be whether the PLAN can successfully consolidate its diverse assets into a cohesive operational framework. This integration will be essential for proving the efficacy of its carrier strike groups in global maritime operations where U.S. submarines continue to hold a strategic advantage.
