M. A. Fallah - Department of Engineering, Payame Noor University (PNU), P.OBox ۱۹۳۹۵-۴۶۹۷, Tehran, Iran

Vessel traveling at sea causes hydrodynamic anomalies in sea water called Kelvin waves. Motion of conductive sea water due to Kelvin waves in natural Earth s magnetic field makes these waves visible using magnetic transducers. Geomagnetic anomaly induced by the motion of vessels may extend several kilometers and stay up long hours under certain conditions which consider this geomagnetic anomaly as a good candidate in marine surveillance. From remote sensing point of view in this work, we proposed a method for detecting vessel geomagnetic anomaly using an airborne magnetic sensor. Analytical formulations are derived and shown that physical properties of hydrodynamic Kelvin waves in shallow water are directly related to vessel parameters such as speed and traveling direction. Numerical simulations are used to demonstrate the applicability of our results. Vessel detection is performed in frequency domain. It is shown that the proposed detection method is noise robust and can be used to detect a vessel in a noisy ambient. Effect of vessel parameters such as velocity and traveling direction in frequency spectrum of received signal are investigated.

Geomagnetic anomaly, vessel, velocity, traveling direction, marine surveillance, shallow water, passive magnetic detector