Naval Surface Warfare Center

About: Naval Surface Warfare Center is a facility organization based out in Washington D.C., District of Columbia, United States. It is known for research contribution in the topics: Radar & Sonar. The organization has 2855 authors who have published 3697 publications receiving 83518 citations. The organization is also known as: NSWC.

Tracking maneuvering targets with an interacting multiple model filter containing exponentially-correlated acceleration models

Abstract: An interacting multiple model (IMM) filter with constant velocity and exponentially-correlated acceleration (ECA) models is proposed for tracking maneuvering targets. An IMM filter is implemented separately in each Cartesian coordinate to allow for different model probabilities in each coordinate. For each coordinate, one of two ECA models is designed to track an increasing acceleration while the other ECA model is designed to track a decreasing acceleration. The IMM filter is designed so that the ECA model with increasing acceleration provides transition from the constant velocity model to the ECA model with decreasing acceleration. The ECA model with decreasing acceleration provides transition to the constant velocity model. Simulated tracking results are given for a constant speed target performing a 'S' trajectory maneuver. >

Improved Method for Calculating Exact Geodetic Latitude and Altitude

Abstract: : An efficient model for transforming Earth-centered, Earth-fixed coordinates to geodetic coordinates is presented. The model systematically derives exact expressions for the geodetic latitude and altitude, which are free of singularities. To the author's best knowledge, no such expressions exist in the literature.

Gps-aided navigation system requirements for smart munitions and guided missiles

Abstract: The Global Positioning System (GPS) is finding increasing use as an effective means of improving accuracy of Inertial Navigation Systems (INS) carried on board guided projectile and missile systems. Two warfare areas that have provided strong motivation for using integrated GPS/INS are Naval Surface Fire Support (NSFS) and Tactical Ballistic Missile Defense (TBMD). This paper presents an overview of various techniques for the integration of the GPS and the INS in a guided weapon system. Then the development of a multi-purpose GPS/INS simulation and analysis tool is described. The model was developed with the flexibility to support a variety of possible technology demonstration and full scale development programs involving GPS-aided guided weapons. The simulation includes detailed models of the GPS satellites and receiver, jamming environment, navigation Kalman filter, inertial navigation system with strapdown inertial measurement unit, six degree-of-freedom airframe and guidance and control components. To illustrate navigation capability, the performance of a GPS-aided smart munition is analyzed in detail. A review of some emerging technology trends and potential future applications for GPS/INS is also provided.