Fig.1

Hybrid model of rotating ellipsoid and dipole array"

Fig.2

Modeling of underwater vehicle by COMSOL"

Fig.3

Distribution of the magnetic anomaly of a given target at a plane with height of 500 m"

Fig.4

Schematic diagram of relationship between magnetic mixing model of vehicle and detection point"

Fig.5

Detection points with regular distribution selected on the plane of a fixed detection height"

Fig.6

Comparison of magnetic anomaly distribution by finite element simulation and model calculation on a plane with detection height of 500 m (regularly selecting detection points on the same plane)"

Fig.7

Detection points randomly selected on a plane with fixed detection height"

Fig.8

Comparison of magnetic anomaly distribution by finite element simulation and model calculation on a plane with detection height of 500 m (randomly selecting detection points on same plane)"

Fig.9

Detection points randomly selected in the detection space"

Fig.10

Comparison of magnetic anomaly distribution by finite element simulation and model calculation on a plane with detection height of 500 m (randomly selecting detection points)"

Fig.11

Influence of points selection methods on the calculation error of fitting model"

Table 1

Evaluation parameters of fitting errors of Ⅰ, Ⅱ and Ⅲ models"

Fig.12

Calculation error of fitted models for three types of vehicles"

Fig.13

Calculation error curve of fitted models for different number of array elements"