Effectiveness analysis of a hard-kill underwater defense system for surface warships against wake-homing torpedo attack


  • Myoungin Shin Agency for Defense Development
  • Wooyoung Hong Sejong University
  • Jinho Lee Korea Naval Academy




wake-homing torpedo, hard-kill type underwater defense system, simulation, effectiveness analysis


We conducted simulations to analyze the effects of a hard-kill-type underwater defense system that defends friendly warships against an enemy wake-homing torpedo. Assuming that the enemy torpedo is a wake-homing torpedo, our surface warship detours to the prespecified evasive course by firing a hard-kill-type system, which is modeled as a passive acoustic homing-torpedo, to attack the enemy torpedo. We analyzed the effectiveness of a warship’s survival probability via Monte Carlo simulation, given the probabilistic angles of the launched torpedoes, to compare two cases where one used only evasive maneuvering and the other used the hard-kill-type underwater defense system with evasion at the same time. By changing the maximum torpedo detection range of a warship and the torpedo’s initial location, we observed that the resulting survival probability of a warship was above 61% with a hard-kill-type defense system, whereas it remained at 34% without a hard-kill defense system, the necessity of a hard-kill underwater defense system, especially against wake-homing torpedoes.


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Author Biographies

Myoungin Shin, Agency for Defense Development

(First Author) Agency for Defense Development, Senior Researcher, [email protected], https://orcid.org/0000-0003-3456-8123.

Wooyoung Hong, Sejong University

(Co-Author) Department of Defense Systems Engineering, Sejong University, Professor, [email protected], https://orcid.org/0000-0002-9022-8425.

Jinho Lee, Korea Naval Academy

(Corresponding Author) Department of Defense Management, Korea Naval Academy, Professor, [email protected], https://orcid.org/0000-0003-4192-3912.


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Flow chart of a hard-kill-type underwater defense system




How to Cite

Shin, M., Hong, W., & Lee, J. (2023). Effectiveness analysis of a hard-kill underwater defense system for surface warships against wake-homing torpedo attack. Journal of Advances in Military Studies, 6(2), 1-15. https://doi.org/10.37944/jams.v6i2.209