Method and apparatus for determining a geomagnetic field by...

Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C033S35500D

Reexamination Certificate

active

11049860

ABSTRACT:
There are provided a method and apparatus for determining a geomagnetic field by using a compass and a method and apparatus for determining an azimuth angle of a moving object using the method and apparatus for determining a geomagnetic field. The method of determining a geomagnetic field by using a compass includes defining an allowable magnetic field range used to determine a valid geomagnetic region; calculating a magnitude of a magnetic field in a geomagnetic-field validity test region by using a compass; and if the magnitude of the magnetic field is within the allowable magnetic field range, determining that the geomagnetic-field validity test region is the valid geomagnetic region, and if not, determining that there is applied an external magnetic field disturbance. Accordingly, since an error of an azimuth angle of the compass due to an external magnetic field disturbance can be determined, it is possible to accurately detect a valid azimuth angle of the compass. In addition, since an allowable magnetic field range is determined based on a variation of magnetic field detected by a compass rather than a conventional method that simply compares a magnetic field and a geomagnetic field, it is possible to accurately determine the geomagnetic field.

REFERENCES:
patent: 4143467 (1979-03-01), Erspamer et al.
patent: 5187872 (1993-02-01), Dufour
patent: 7069663 (2006-07-01), Kwon et al.
patent: 2005/0126023 (2005-06-01), Kwon et al.
patent: 2005/0223575 (2005-10-01), Fillatreau et al.
patent: 2003-65791 (2003-03-01), None
Stergios I. Roumeliotis et al., “Circumventing Dynamic Modeling: Evaluation of the Error-State Kalman Filter Applied to Mobile Robot Localization”, Proceedings of the 1999 IEEE International Conference of Robotics & Automation, Detroit, Michigan, May 1999, pp. 1656-1663.
Sheng-Wu Liu et al., “Research on High Preceision Intelligent Digital Magnetic Heading System”, Proceedings of the 1994 IEEE International Conference on Industrial Technology, 1994, pp. 734-737.
Korean Office Action dated Jun. 28, 2005, and English translation.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for determining a geomagnetic field by... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for determining a geomagnetic field by..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for determining a geomagnetic field by... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3781487

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.