Integrated magnetic field sensors for fuzes
First Claim
1. An apparatus for electronically controlling ordnance fuzes, said apparatus comprising a magnetic field sensor sensing phase and magnitude of earth'"'"'s local ambient magnetic field, said magnetic field sensor comprising a giant magnetoresistance detector.
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Abstract
An apparatus and method for electronically controlling ordnance fuzes by sensing magnetic fields proximate the ordnance via a magnetic field sensor. The sensor is preferably a giant magnetoresistance detector. For spinning ordnance, in-flight cumulative range can be calculated by counting turns of the spinning ordnance. Ordnance may be armed a pre-determined time after exit of the ordnance from a weapon firing the ordnance as determined by the magnetic field sensor. The invention is also of a giant magnetoresistance sensor and method for making same and an apparatus for and method of sensing angular velocity for spinning ordnance.
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12 Claims
- 1. An apparatus for electronically controlling ordnance fuzes, said apparatus comprising a magnetic field sensor sensing phase and magnitude of earth'"'"'s local ambient magnetic field, said magnetic field sensor comprising a giant magnetoresistance detector.
- 6. A method for electronically controlling ordnance fuzes, the method comprising sensing phase and magnitude of earth'"'"'s local ambient magnetic field proximate the ordnance via a magnetic field sensor, the magnetic field sensor comprising a giant magnetoresistance detector.
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11. An angular velocity sensor for spinning ordnance, said sensor comprising:
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a turns counter comprising a magnetic field sensor, said magnetic field sensor comprising a giant magnetoresistance detector; and
means for computing a time derivative of an inverse sine of an output of said turns counter.
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12. A method of sensing angular velocity for spinning ordnance, the method comprising the steps of:
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counting turns of the ordnance via a magnetic field sensor, the magnetic field sensor comprising a giant magnetoresistance detector; and
computing a time derivative of an inverse sine of an output of the counting step.
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Specification