NDLI: Real-time Java in modernization of the aegis weapon system

Content Provider	ACM Digital Library
Author	Nilsen, Kelvin
Abstract	The U.S. Navy's Aegis system, considered to be the "shield of the fleet", provides area air defense for a carrier battle group in addition to providing long-range ballistic missile defense. A typical Aegis deployment consists of about 100 computers, many of which have multiple cores. The application is distributed, with typical real-time threads spanning 4 or 5 different computers. End-to-end distributed thread timing constraints measured from stimulus to response are typically under 100 ms. The target jitter constraints on the individual contributions of processors to the end-to-end deadline constraint are well below 1 ms. The system is fully redundant to support fault tolerance. The software is considered to be safety critical because it aims and fires weapons. The Aegis Weapons System software was recently rewritten into real-time Java as part of the Aegis Modernization activity. This project involved replacement of about 200,000 lines of CMS-2 and Ada code with roughly 500,000 lines of Java. The effort began in 2003 and the new Java implementation of Aegis Weapons System is now being deployed on warships. This paper describes the motivation for the modernization effort and provides a summary of Lockheed Martin's experiences with this project.
Starting Page	63
Ending Page	70
Page Count	8
File Format	PDF
ISSN	10943641
DOI	10.1145/2402709.2402699
Journal	ACM SIGAda Ada Letters (ALET)
Volume Number	32
Issue Number	3
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1989-04-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mixed-model development Java Mission-critical Dynamic storage management Object-oriented development High-integrity systems Real-time Safety-critical
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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