Real-Time Environmental Noise Reduction for Multi-Mode Magnetometers

"Dynamics Technology, Inc. (DTI) will develop, test, and build a set of real-time environmental noise reduction algorithms to be used in conjunction with the prototype Multimode Magnetic Detection System (MMMDS) being sponsored by the Office of NavalResearch (ONR). The MMMDS consists of two airborne, spatially separated, laser-pumped helium magnetometers capable of being processed in either single-signal mode, signal-differential (gradiometer) mode, or single-sensor with surface based referencesensor mode. The DTI algorithms will operate in each of these modes, and will be designed to cancel much of the environmental noise present in both the magnetic anomaly detection (MAD) and extremely low frequency emission (ELFE) bands. The environmentalnoises to be treated include those resulting from non-stationarity of the geomagnetic field, aircraft translation over subsurface magnetic anomalies, and buffeting through the geomagnetic gradient. An adaptive noise cancellation module will also bedeveloped based on an algorithm derived by another project member.The proposed Phase II effort consists of four tasks, plus two options. During the baseline effort DTI will develop a signal/noise simulator, perform system performance analyses, developprototype algorithms, and deliver a real-time processor design. In the options, the algorithms will be evaluated using test data, and a real-time processor will be built."