Magnetic compass compensation system

Patent 4327498 Issued on May 4, 1982. Estimated Expiration Date:

March 17, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

2692970

2852859

3530375

3639828

3696518

Pendulous induction compass transmitter including means external to the transmitter to compensate for heading errors in turns due to the vertical component of the Earth's magnetic field and due to two cycle error Patent #: 4112754
Issued on: 09/12/1978
Inventor: Suminsby

Inventors

Assignee

Sperry Corporation

Application

No. 06/130758 filed on 03/17/1980

US Classes:

33/333, Structurally installed including relation to feature thereof324/225, With compensation for test variable33/352, Includes magnetic compass33/356, Error indicator, preventor, or compensator33/361, Electro-magnet or inductor (e.g., flux valve, etc.)702/93, By another sensor73/178RNAVIGATION

Examiners

Primary: Martin, William D. Jr.

Attorney, Agent or Firm

Terry; Howard P.

International Classes

G01C 17/00 (20060101)
G01C 17/38 (20060101)

Abstract

In a magnetic compass compensation system suitable for use within a ferrous land vehicle, a secondary magnetic sensor senses, the total magnetic field as components along a three axis system drawn vertical, lateral and transverse to the ferrous vehicle. Compensation signals corresponding to the permanent and induced magnetic fields of the vehicle are isolated from the total magnetic field. The compensation signals are applied to compensation coils surrounding a primary magnetic sensor for providing an output equivalent to the horizontal components of the earth's undisturbed magnetic field.