Magnetic anomaly sensing-based system for tracking a moving...

Details Magnetic anomaly sensing-based system for tracking a moving... Magnetic anomaly sensing-based system for tracking a moving...

2006-04-17

2008-03-11

Aurora, Reena (Department: 2862)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

C324S345000, C324S244000, C324S207110

Reexamination Certificate

active

07342399

ABSTRACT:
A system for tracking a moving magnetic target uses a magnetic anomaly sensing system to continually determine magnetic gradient tensors associated with the target and converts the magnetic gradient tensors to gradient contraction scalars. A processor uses the magnetic gradient tensors and gradient contraction scalars to determine a minimum of bearing and range to the target. A velocity of the target is determined using the determined bearing and range at two points in time as the target is moving. To continually track with the moving target, the processor determines adjustments in elevation and azimuth using the magnetic gradient tensors and gradient contraction scalars along with bearing, range and determined velocities of the target. The processor can include a routine that determines range while accounting for asphericity errors introduced by the aspherical nature of constant magnetic gradient contours associated with the target.

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Wiegert et al., Generalized Magnetic Gradient Contraction Based Method for Detection, Localization and Descrimination of Underwater Mines and Unexploded Ordinance, IEEExplore, 2004, entire disclosure.

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