US3697869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for generating compensating signals for magnetic effects of aircraft on mad system
Assignee: United States Department of the Navy
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Filing: 1970-09-23
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Granted: 1972-10-10
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Expires: 1990-09-23
Abstract
Abstract A compensation system for neutralizing an aircraft''s magnetic effects on a magnetic anomaly detector system by generating compensating magnetic signals to neutralize the aircraft''s magnetic effects on the detector system. Three sets of flux gate sensors or three total field sensors generate electrical signals of a magnitude indicative of a sensed magnetic field. The electrical signals are operated upon to provide compensating signals equal and opposite to an aircraft''s magnetic effects on a magnetic anomaly detector.
Inventors
- 👤 Myron M Greenberg
- 👤 Steven A Macintyre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:20
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/025; G01R33/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
218 words
A compensation system for neutralizing at a point an axial component of the magnetic field changes introduced by an aircraft along a predetermined axis comprising: first, second and third sensor means spaced a first, second and third distance from the point for sensing an axial component of total magnetic field along said predetermined axis and generating respectively first, second and third electrical signals indicative of the respective magnitudes of the magnetic fields sensed; and a signal processor having first difference means connected to receive said second and third electrical signals from said second and third sensor means for generating an output signal that is the difference between said second and third electrical signals, second difference means connected to receive said first and second electrical signals from said first and second sensor means for generating an output signal that is the difference between said first and second electrical signals, and operational means connected to receive the output of said first and second difference means for generating an electrical compensating signal for correcting at the point the variation in total magnetic field along said predetermined axis introduced by said aircraft, and magnetic generating means connected to receive said electrical compensating signal for generating a magnetic compensating signal that neutralizes at the point the axial component of the magnetic field changes.
Claim 2
Dependent Claim
218 words
A compensation system for neutralizing at a point an axial component of the magnetic field changes introduced by an aircraft along a predetermined axis comprising: first, second and third sensor means spaced a first, second and third distance from the point for sensing an axial component of total magnetic field along said predetermined axis and generating respectively first, second and third electrical signals indicative of the respective magnitudes of the magnetic fields sensed; and a signal processor having first difference means connected to receive said second and third electrical signals from said second and third sensor means for generating an output signal that is the difference between said second and third electrical signals, second difference means connected to receive said first and second electrical signals from said first and second sensor means for generating an output signal that is the difference between said first and second electrical signals, and operational means connected to receive the output of said first and second difference means for generating an electrical compensating signal for correcting at the point the variation in total magnetic field along said predetermined axis introduced by said aircraft, and magnetic generating means connected to receive said electrical compensating signal for generating a magnetic compensating signal that neutralizes at the point the axial component of the magnetic field changes.
Claim 3
Dependent Claim
143 words
A compensation system for neutralizing at a point an axial component of the magnetic field changes introduced by an aircraft along a predetermined axis according to claim 1 wherein said operational means further comprises: divider means connected to said first and second difference means for generating an output electrical signal that is the quotient of said first and second difference means output signals; function generator means connected to said divider means for generating an output signal that is a function of the location along said predetermined axis of a fictitious source of the magnetic field changes introduced by said aircraft; and multiplier means connected to said function generator means and said first difference means for generating an output signal that is indicative of the product of said output signal of said function generator means and said output signal of said first difference means.
Claim 4
Independent Claim
167 words
A system for generating an electrical compensating signal indicative of an axial component of the magnetic effects of an aircraft at a point comprising: first, second and third sensor means spaced a first, second and third distance from the point for sensing an axial component of total magnetic field along a predetermined axis and generating respectively first, second and third electrical signals indicative of the respective magnitudes of the magnetic fields sensed; an electrical generator having first difference means connected to receive said Second and third electrical signals from said second and third sensor means for generating an output signal that is the difference between said second and third electrical signals, second difference means connected to receive said first and second electrical signals from said first and second sensor means for generating an output signal that is the difference between said first and second electrical signals, and operational means connected to receive the output of said first and second difference means for generating the electrical compensating signal.
Claim 5
Independent Claim
167 words
A system for generating an electrical compensating signal indicative of an axial component of the magnetic effects of an aircraft at a point comprising: first, second and third sensor means spaced a first, second and third distance from the point for sensing an axial component of total magnetic field along a predetermined axis and generating respectively first, second and third electrical signals indicative of the respective magnitudes of the magnetic fields sensed; an electrical generator having first difference means connected to receive said Second and third electrical signals from said second and third sensor means for generating an output signal that is the difference between said second and third electrical signals, second difference means connected to receive said first and second electrical signals from said first and second sensor means for generating an output signal that is the difference between said first and second electrical signals, and operational means connected to receive the output of said first and second difference means for generating the electrical compensating signal.
Claim 6
Dependent Claim
134 words
A system for generating an electrical compensating signal indicative of an axial component of the magnetic effects of an aircraft at a point according to claim 3 wherein said operational means further comprises: divider means connected to said first and second difference means for generating an output electrical signal that is the quotient of said first and second difference means output signals; function generator means connected to said divider means for generating an output signal that is a function of the quotient of said first and second difference means output signals; and multiplier means connected to said function generator means and said first difference means for generating an output signal that is indicative of the product of said output signal of said function generator means and said output signal of said first difference means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |