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Generalization of target-based magnetic anomaly detection by means of a multipole expansion

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Abstract

Magnetic Anomaly Detection (MAD) refers to a passive method used for anti-submarine warfare, and is typically fulfilled by an aircraft carrying a magnetometer and flying over a maritime area, searching for hidden submarines. The most widespread approach consists in building a detection strategy based on a dipolar model for the target. Although convenient for modeling purposes, the dipole approximation is nonetheless quite restrictive, by definition. In this study, we propose a generalization of the MAD through a multipolar target model based on a spherical harmonic expansion of the magnetic field. This model provides a more precise description of the anomaly and serves a twofold objective: to improve the detection performance, and to widen the variety of detectable targets. For this purpose, the detection strategy usually adopted for dipolar targets – namely an orthonormal basis function (OBF) decomposition followed by a generalized likelihood ratio test (GLRT) – is revisited in the multipolar scenario. This method encompasses and generalizes the dipolar approach. However, the keystone of the detection is the estimation of the maximal order of the multipole that should match the target at best. This is achieved by applying the Akaike information criterion (AIC), which helps us choose the model (i.e. the multipolar order) that minimizes the information loss. The detection performance are assessed analytically and verified by Monte-Carlo simulations. Several simulated scenarios with multipolar targets reveal a clear gain of performance, which illustrates the relevance of the generalization, especially in a context where even a slight gain could mean much.
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Dates and versions

hal-01208490 , version 1 (02-10-2015)

Identifiers

  • HAL Id : hal-01208490 , version 1

Cite

Pascal Pepe, Steeve Zozor, Laure-Line Rouve, Jean-Louis Coulomb, Christine Serviere, et al.. Generalization of target-based magnetic anomaly detection by means of a multipole expansion. MARELEC 2015 - International conference on marine electromagnetics, Jun 2015, Philadelphie, United States. ⟨hal-01208490⟩
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