Magnetic anomaly sensing system and methods for maneuverable sensing platforms
US6476610B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2001 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Apr 24, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/15
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system and method for sensing magnetic anomalies uses a gradiometer having at least one pair of triaxial magnetometer-accelerometer (TMA) sensors. Each TMA sensor has X, Y, Z magnetic sensing axes and X, Y, Z acceleration sensing axes that are parallel to one another and to the X, Y, Z magnetic sensing and acceleration axes of all other TMA sensors. Each TMA sensor outputs components (Bx, By, Bz) of local magnetic fields and components (Ax, Ay, Az) of local gravitational acceleration fields. The components (Bx, By, Bz) and (Ax, Ay, Az) output from each TMA sensor are processed to generate motion-compensated components (Bcx, Bcy, Bcz) of local magnetic fields. A difference is generated between the motion-compensated components (Bcx, Bcy, Bcz) for each pair of TMA sensors thereby generating differential vector field components (&Dgr;Bx, &Dgr;By,&Dgr;Bz). For improved accuracy, the differential vector field components (&Dgr;Bx, &Dgr;By, &Dgr;Bz) are adjusted using the local gravitational acceleration field components and motion-compensated local magnetic field components in order to compensate for gradiometer motion. Gradient components are generated using the differential vector fi…
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