Use of GPS Navigation in the Norwegian Naval Strike Missile

M. Meen, J. Nielson

Abstract:	The Naval Strike Missile (NSM) Anti-Ship Missile is an autonomous, long-range, precision missile. The missile is designed to engage high-value, well-defended targets at sea and in littoral waters. The navigation system consists of a tactical grade Inertial Measurement Unit (IMU) aided by a military L1/L2 SAASM GPS receiver and a laser altimeter to provide terrain correlation for overland flights, and height estimation when over water. The fiber optic IMU is the core sensor in the navigation system. INS algorithms integrate IMU measurements which are combined with measurements from a GPS receiver and a laser altimeter in a Kalman filter. Correction algorithms calculate position, velocity and attitude based on the IMU measurements and the error estimates. The IMU also provides aiding data to the GPS during flight. This approach aids initial acquisition and ensures rapid reacquisition after satellite outages due to maneuvers or jamming. The main objective of the navigation system is to determine the missile’s position and attitude during flight and send data to the Flight Control System which in turn makes corrections to keep the missile on its programmed flight path, in the position and time domains. The purpose of the navigation system is to guide the missile to a predefined error-circle. Typically this defines the start of the terminal phase where an intelligent infrared imaging seeker (I3R) steers the missile towards the selected target. Initial flight tests were performed using a small propeller aircraft in order to test the navigation system with the laser altimeter. High speed flight tests were later performed by installing the navigation components and the seeker inside a fuel tank and mounted on an F-5 fighter aircraft. Final flight tests were performed with the complete missile system with several test firings in France and in the US.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	124 - 133
Cite this article:	Meen, M., Nielson, J., "Use of GPS Navigation in the Norwegian Naval Strike Missile," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 124-133.
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