Joseph F. Caligiuri

Peer Reviewed

Abstract: The SGN-4, Sperry Gyro Navigator, a marine inertial navigation system, is an outgrowth of the Sperry MK 19 Gyro Compass. The MK 19 equipment combines in one instrument a precision gyro compass and vertical and it has been the Navy standard navigation equipment on all new construction for the past decade and a half. While retaining the basic simplicity and reliability of the MK 19 concept, the SGN-4 utilizes improved inertial components, inertial gyro drift reduction techniques and a flexible general purpose digital computer. The resultant gyro navigator improves the basic compass and vertical capability of the MK 19 and extends it to provide inertial position and velocity outputs. The SGN-4 is designed to operate independently of other navigation equipment. The internal gyro drift reduction techniques alleviate the need for heading fixes to achieve accurate long term navigation. The SGN-4 is capable, however of integration with other navigational aids such as loran, sonar bench marks, star tracker et al, into a complete navigation system. The SGN-4 is designed to fill the need for a medium to high performance, low cost inertial navigator for applications such as: anti-submarine warfare, tactical missile and anti-aircraft fire control, aircraft inertial platform alignment on carriers and special oceanographic missions. The SGN-4 program was funded under a BuShips contract and the U.S. Navy and Sperry shared in the development costs. One prototype system has been delivered to the U.S. Navy and is under evaluation at the Naval Applied Science Laboratory, Brooklyn, New York.
Published in: NAVIGATION: Journal of the Institute of Navigation, Volume 12, Number 2
Pages: 123 - 131
Cite this article: Caligiuri, Joseph F., "SGN-4, LOW-COST MARINE INERTIAL NAVIGATOR", NAVIGATION: Journal of The Institute of Navigation, Vol. 12, No. 2, Summer 1965, pp. 123-131.
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