Geomagnetic Coherence Trial #3


  1. Nelson, J.B.
  2. Marcotte, D.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);National Research Corp, Cambridge MA (US)
DRDC Atlantic and the Naval Air Warfare Centre – Aircraft Division (NAWC-AD) are developing techniques for modeling and removing geological and geomagnetic noise in magnetic anomaly detection (MAD) systems. The aim of this collaborative work is to improve submarine detection ranges in littoral areas. The Office of Naval Research (ONR) is partially funding this research. In August 2006, the National Research Council Convair research aircraft was used to gather aeromagnetic data over the continental shelf of the United States. Magnetic basestation data were collected at a number of nearby on-shore sites. The primary objectives were to separate the effects of geology (spatial) and geomagnetic (temporal) noise sources, quantify the degree of geological noise cancellation possible using multiple-passes down the same flight line, measure the coherence of the geomagnetic field from on-shore to off-shore environments as a function of distance and altitude, and thus quantify the geomagnetic noise cancellation possible. The secondary objective was to measure the magnetic anomalies due to non-linear littoral internal waves (NLIWs). Theoretical calculations suggest that these anomalies can have very similar amplitudes and wavelengths as submarine MAD signals and thus can be a source of False Alarms in MAD systems. This report describes the experiment and the status of ONR Grant N00014-06-1-0127.

Il y a un résumé en français ici.

Report Number
DRDC-ATLANTIC-ECR-2006-266 — External Client Report
Date of publication
01 May 2007
Number of Pages

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