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Accurate measurement of angular motions of spinning bodies with on-board sensors has long been recognized as a daunting task. Recent advances in magnetic sensor technologies have yielded devices small enough. rugged enough, and sensitive enough to be useful in systems making high-speed, high-resolution measurements of attitude relative to magnetic fields when installed on free-flying bodies. Such a measurement system, called a "MAGSONDE" (MAGnetic SONDE), has been designed for use in spinning projectiles for the estimation of in-flight angular orientation with respect to the earth's magnetic field. The MAGSONDE is comprised of both an apparatus and a methodology that determines orientation from sensor phase measurements. Sensor scale factor variations will not affect MAGSONDE performance. Other significant features of MAGSONDE are its day/night and all weather capability and its use of non-emissive, passive sensors. Potential applications for MAGSONDE include, but are not limited to, navigation aids and determination of angular motion histories of experimental, developmental and tactical projectiles.

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