PURPOSE: To display the updated accurate present position of the moving body, by averaging the output of a magnetic azimuth sensor every time the moving body runs a specified distance, thereby removing the effect of the geomagnetism disturbance regardless of the running speed.
CONSTITUTION: Detected signals VX and VY from the magnetic azimuth sensor 1 are integrated in integrator 13 and 14. Gates 16W18 are opened by pulse signals outputted from a speed sensor 7. The contents of the integrators 13 and 14 and a timer 15 are transmitted to dividers 19 and 20 through the gates 16W18. The integrators 13 and 14 and the timer 15 are reset. In this way, the detected signals VX and VY are averaged every time the moving body runs a specified distance, and the effect of the geomagnetism disturbance generated on a elevated road is removed regardless of the running speed.
HIROCHIKA TAKASHI
TSUSHIMA NOBORU
