(19)
(11) EP 2 028 504 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
05.08.2009 Bulletin 2009/32

(43) Date of publication:
25.02.2009 Bulletin 2009/09

(21) Application number: 07425537.3

(22) Date of filing: 23.08.2007
(51) International Patent Classification (IPC): 
G01R 33/02(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(71) Applicant: STMicroelectronics S.r.l.
20041 Agrate Brianza MI (IT)

(72) Inventors:
  • Vocali Francesco
    50053 Empoli (IT)
  • Biganzoli Fabio
    21040 Jerago (IT)

(74) Representative: Cerbaro, Elena 
STUDIO TORTA Via Viotti 9
10121 Torino
10121 Torino (IT)

   


(54) Method and device for calibrating a magnetic sensor


(57) According to the method for calibrating a magnetic sensor, measurements (MI) are acquired from a magnetic sensor (11) during a non-pre-ordered movement, and a plurality of sets of solutions (SSETK) are determined for respective expected values (HK) of intensity of the Earth's magnetic field. The solutions (SK) are defined by a plurality of parameters, amongst which a gain value (GMX, GMY, GMZ) for each detection axis (X', Y', Z') of the magnetic sensor (11). For each solution (SK) a figure of merit (E(SK)) is then determined, correlated to a calibration error, and a partial solution (SKB) is selected in each set of solutions (SSETK), on the basis of the figure of merit (E(SK)). Once a gain confidence interval (IG) has been defined, a calibration solution (SCAL) is selected on the basis of the figure of merit (E(SK)), from among the partial solutions (SKB) having respective gain values (GMX, GMY, GMZ) all falling within the gain confidence interval (IG).