"ERGM" redirects here. The term may also refer to the exponential random graph model.
Navy Image of an ERGM
The Extended Range Guided Munition was a precision guided rocket-assisted 5-inch (127 mm) shell (projectile) development by Raytheon for the U.S. Navy. The program was cancelled in March 2008 after twelve years of development and over 600 million dollars in funding.[1] The developmental round was designated EX 171.[2]
ERGM consisted of three major subsections: propulsion (rocket motor), warhead, and Guidance, Navigation and Control section. ERGM is fired from the 127 mm (5 inch) 62 Caliber Mark 45 gun Mod 4, at which point the fins would deploy and the rocket motor would ignite, lifting the munition to at least 80,000 feet (24 km), after which the canards would deploy and guide the ERGM to the target using GPS guidance. It was to be used on Arleigh Burke-class destroyers hulls DDG-81 onward.[3]
A similar system (though for MLRS) developed by SAAB and Boeing reached production in 2019 and is known as the GLSDB.
^Torres, Rene. "Raising the Iowa: Reactivating the Iowa Class Battleships to Fill the Current Naval Surface Fire Support Vacancy" (PDF). Marine Corps Combat Development Command. p. 9. Archived (PDF) from the original on 2021-11-21. Retrieved 2023-01-07.
^Raytheon ERGM (5" Projectile MK 171) - Designation Systems
^Wertheim, Eric (2005). The Naval Institute Guide to Combat Fleets of the World, 2005–2006: Their Ships, Aircraft, and Systems. Annapolis, Maryland: Naval Institute Press. p. 946. ISBN 978-1591149347.
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