A Point-wise Solution for the Magnetic Field Vector

Abstract

Approved for public release; distribution is unlimited. AbstractMagnetometers offer measurements that define the angle to the magnetic field. Knowledge of this restricts the axis of interest to lie on a cone centered on the magnetic field direction with an angle proportional to the measurement of magnetic field strength. With this restriction, formulae are derived for finding the relationship between the magnetic field pointing vector, the spin axis, and the magnitude of the magnetic field. Methods based on both calibrated and uncalibrated magnetometers are discussed. These formulae are also useful for the calibration of magnetometers. ACKNOWLEDGMENTSThe author would like to thank Bernard Guidos of the U.S. Army Research Laboratory for his suggestions that improved this report.in

A microcontroller solution for AMR magnetic sensing in flying munitions systems

“…The magnetic sensor needed is a 3-axis magnetometer or a combination of three one-axis magnetometers, which can pick up the projection of the Earth's magnetic field on each axis. These data can be used to determine the azimuth (heading direction) and the spin rate of the flying vehicle [1][2][3][4][5]. The magnetometer we chose is an anisotropic magnetoresistive (AMR) sensor [6][7], which consists of four permalloy thin-film resistor stripes deposited on a silicon wafer and arranged in a Wheatstone bridge configuration, The permalloy is an alloy of nickel and iron with high magnetic permeability.…”