Location detecting apparatus
June 3, 2012. 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.Patent ReferencesApparatus for visually indicating the current location of an automotive vehicle Vehicle bearing detection and data processing methods applicable to vehicle navigation system GPS/self-contained combination type navigation system Vehicle driving azimuth detecting apparatus for correcting a disturbed geomagnetic azimuth Vehicular traveling direction measuring system Navigation system for vehicle Vehicle navigation apparatus Patent #: 5220509 InventorAssigneeApplicationNo. 893063 filed on 06/03/1992US Classes:701/207, Employing position determining equipment340/988, VEHICLE POSITION INDICATION342/357.14, Combined with secondary navigation system (i.e., LORAN, gyroscope, inertial, dead reckoning, etc.)701/221, With correction by noninertial sensor701/224With indicated course correction (compass deviation)ExaminersPrimary: Chin, GaryAttorney, Agent or FirmInternational ClassG06F 015/50Foreign Application Priority Data1991-06-18 JPAbstractA location detecting apparatus comprising an autonomous location detecting unit mounted in a moving body to calculate a distance traveled by the moving body and an estimated heading of the moving body and to detect an estimated location of the moving body on the basis of the distance traveled and the estimated heading, a receiving unit for detecting a location of the moving body by receiving waves from satellites circling around the Earth in predetermined orbits and for providing location information corresponding to the detected location, a unit to detect a difference of location between the location detected by the receiving unit and the estimated location, a location correcting unit which corrects the estimated location to the location detected by the receiving unit when the difference of location is more than a first predetermined value, a magnetic sensor for detecting an heading of the moving body by sensing a geomagnetic field, and a heading correcting unit which corrects the estimated heading to the heading detected by the magnetic sensor, when the difference of location is more than the first predetermined value after the estimated location was corrected and before the moving body travels a predetermined distance.Other References
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