Development of a projectile spin counter and orientation sensor

Bradford S. Davis; Mark Clymer; Glenn Graves

doi:10.1117/12.243009

17 June 1996 Development of a projectile spin counter and orientation sensor

Bradford S. Davis, Mark Clymer, Glenn Graves

Proceedings Volume 2742, Targets and Backgrounds: Characterization and Representation II; (1996) https://doi.org/10.1117/12.243009
Event: Aerospace/Defense Sensing and Controls, 1996, Orlando, FL, United States

Abstract

The performance of many tactical sensor systems, especially inertial measurement units (IMUs), suffers when operating in the presence of spin. Sensor Applications has developed a magnetic field sensor, or spin counter, that is capable of switching once per revolution through the earth's magnetic field. The miniature sensor, which eventually will consist of a single ASIC chip, uses the properties of giant magnetoresistance ratio (GMR) materials. The sensor has been designed so that it is immune to local field strength variations. A spin sensor could aid or replace other sensing systems by providing a true measurement of the projectile's roll rate and by determining up from down, which is a very important factor for inertially navigated munitions. High-g shock tests and gyroscopic tests of the sensor have been performed by the U.S. Army Research Laboratory (ARL) to characterize its performance at conditions produced by artillery projectiles. Helmholtz coil testing of the sensor exposed to differing magnetic field conditions was also investigated by Sensor Applications. Initial test results look promising. This paper describes the development of the spin counter, summaries the test results, and discusses the many benefits of this sensor.

Citation Download Citation

Bradford S. Davis, Mark Clymer, and Glenn Graves "Development of a projectile spin counter and orientation sensor", Proc. SPIE 2742, Targets and Backgrounds: Characterization and Representation II, (17 June 1996); https://doi.org/10.1117/12.243009

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