| 摘要 |
PCT No. PCT/DE87/00479 Sec. 371 Date Jun. 26, 1989 Sec. 102(e) Date Jun. 26, 1989 PCT Filed Oct. 22, 1987 PCT Pub. No. WO88/05154 PCT Pub. Date Jul. 14, 1988.A method for determining the north direction or the travel direction of a vehicle having an electronic compass is proposed by means of which field disturbances at the magnetometer of the compass, occurring during the navigation drive, are measured and evaluated for avoiding angle errors on the direction indication of the compass. For this purpose, the measurement values (Px, y) of the magnetometer are continuously checked by an evaluating circuit of the navigation system and with a deviation ( DELTA x, y) of several successive measurement values past a predetermined tolerance range (A) of the locus diagram and a simultaneous angle change of the earth's magnetic field vector, an intervention is effected in the direction indication. In this connection, according to the invention, the rate of change ( DELTA zeta /t) of the direction indicated by the compass is limited to a predetermined value (B/C), this limit value (B/C) being weighted in dependence on the duration (t1, t2) of the measurement value deviation and the limit of the rate of the indicated direction change ( DELTA zeta /t) (FIG. 4).
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