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Limitations to conductive target detection in AEM systems come from the high noise encountered at low base frequencies, caused by rotations of vector magnetic field sensors in the Earth’s magnetic field. We use rotation-rate sensors to predict and subtract the rotation noise from rigidly coupled ARMIT magnetic field sensors.
,We aim to eliminate or reduce significant impediments to conductive target detection and conductive cover penetration in airborne electromagnetic (AEM) systems. Existing limitations come from the very high noise encountered at low base frequencies, caused by rotations of vector magnetic field sensors in the Earth’s magnetic field. We use the output of tri-axial rotation-rate sensors to predict and subtract the rotation noise from rigidly coupled ARMIT magnetic field sensors. The approach is successful in reducing rotation noise by one to two orders of magnitude at low frequencies.
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