The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 23, 2008
Filed:
Jun. 15, 2005
Applicants:
Jakke Makela, Turku, FI;
Pekka Naula, Piispanristi, FI;
Terho Kaikuranta, Piispanristi, FI;
Inventors:
Assignee:
Nokia Corporation, Espoo, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01L 7/00 (2006.01); G01L 9/00 (2006.01); G01L 11/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Altimeters correct themselves by analyzing pressure data to identify underlying climatic changes and modify sensed pressures accordingly to provide corrected altitude values. The detected underlying climatic changes are used to provide a barometer function independent of altitude changes. Air pressure measured at a plurality of times is stored to provide historical pressure data. A reference pressure is modified in dependence on historical data to produce a modified reference pressure. An altitude value is obtained from the current air pressure value and the modified reference pressure and stored.