Publication Date:
2020-12-15
Description:
The characteristics of the geomagnetic field and its artificial components make the capability of
reading and classifying large underwater cinematic sources (e.g. submarines) somewhat
random. As an example the “ASW far detection procedure” is also affected by the induced
magnetic field produced by man-made telluric currents. This could generate some dangerous
false alarm. The problem is not an instrumental issue related to the instrument precision of the
sensor (commercial magnetometers have precisions greater than the one required by the
application) but a classical metrological matter that could be overcome with a correct
measurement procedure. This moves the problem from technological to phenomenological
aspects. By applying the C.A.I.MA.N. (Coastal Anti-Intruder MAgnetometric Network)
experience, inter-nodal distances in the observation chain were calculated so as to correlate the
noise and de-correlate the target signal (source type SU.S. "SUbmarine Standard"). By means of
C.A.I.MA.N. protocols, targets signal contained in the “detection magnetogram” F(target) was
isolated from F(noise+target) magnetogram using F(noise) (that includes also natural variations)
as Time-Domain filter, and then submitted to standard LP procedure to increase the information
capability. Finally, to overcome metrological problems related to the low incremental ratio
[∂F/∂s]ds of the detected signal, we propose a power domain analysis of the detection
magnetogram. Also without a dedicated technology, in a preliminary experiment for SU.S.
detection the C.A.I.MA.N. anti-intruder system has been occasionally modified: the first results
obtained in this study were found encouraging and further detailed investigations within this
framework should be undertaken in a future study.
Description:
Published
Description:
IFA, Spain
Description:
6A. Monitoraggio ambientale, sicurezza e territorio
Description:
restricted
Keywords:
underwater detection systems, port protection, magnetic signal processing, underwater magnetometers array
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
Conference paper
