Electromagnetic Propagation Characteristics of Submarine Cable Detection With Finite Element Analysis

Marine weak magnetic measurement is one of the important research directions today. Detecting and identifying undersea cables is a key task in marine weak magnetic measurement. Studying the principle of magnetic anomaly of these cables and establish their magnetic anomaly models is the basis of magnetic detection, location and recognition. The magnetic field of an undersea cable is mainly composed of the current and the cable material itself. When the sensor is far from the cable, the weak magnetic field's strength is at the pico-Tesla (pT) level or even at the femto-Tesla (fT) level. For detecting undersea cables, a theoretical calculation model for the transmission characteristics of the magnetic field in the marine environment had been derived, and its attenuation rule in the ocean was analyzed in this paper. A simulation model for the cables had been established. Simulation results showed that SQUID (Superconducting QUantum Interference Device) can detect and identify cables at distances over 1 km.