Abstract
The paper tackles the problem of reading singularities of the geomagnetic field in noisy underwater (UW) environments. In particular, we propose a novel metrological approach to measuring low-amplitude geomagnetic signals in hard noisy magnetic environments. This research action was launched to develop a detection system for enforcing the peripheral security of military bases (harbors/coasts and landbases) and for asymmetric warfare. The concept underlying this theory is the spatial stability in the temporal variations of the geomagnetic field in the observation area. The paper presents the development and deployment of a self-informed measurement system, in which the signal acquired from each sensor—observation node—is compared with the signal acquired by the adjacent ones. The effectiveness of this procedure relates to the inter-node (sensor-to-sensor) distance, L; this quantity should, on one hand, correlate the noise and, on the other hand, decorrelate the target signal. The paper presents the results obtained, that demonstrate the ability of self-informed systems to read weak magnetic signals even in the presence of very high noise in low-density ionic solutions (i.e. sea water).
Highlights
The classic approach to magnetic detection is based on “field of measure” in either direct form or incremental form. This metrological approach cannot solve the diver-detection problem because the amplitude of the target signal is negligible as compared with the noise, and a large portion of the target wavelength lies within the noise band
As compared with those research actions, this paper presents the advances and experimental results obtained by applying a novel technique, that is, the measurement of magnetic local singularity based on self-informed metrology
The high-frequency limit of this band has the same order of amplitude of the target magnetic signals associated with artificial sources, that are the aim of this research study [6]
Summary
In the current scenario of international politics, the asymmetric threat represents. O. The classic approach to magnetic detection is based on “field of measure” in either direct form (measure of A [nT]) or incremental form (measure in ΔA [nT]) This metrological approach cannot solve the diver-detection problem because the amplitude of the target signal is negligible as compared with the noise, and a large portion of the target wavelength lies within the noise band. The metrology of mag singularity shifts the focus from raw field measurements to “space stability” measures, and introduces the distinction between “local” and “diffuse” magnetic signals. This new parameter of classification can solve the problem of detecting small magnetic sources in noisy environments [3]. As compared with those research actions, this paper presents the advances and experimental results obtained by applying a novel technique, that is, the measurement of magnetic local singularity based on self-informed metrology
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