Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1983-02-10
1986-11-18
Haroian, Harry N.
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
33361, G01C 1730
Patent
active
046227547
ABSTRACT:
A drive guide system for an automotive vehicle indicates the remaining distance to a destination and the direction to the destination. In order to indicate the remaining distance and the direction in which to travel, travelling direction and travelling distance are detected. A direction sensor for detecting the terrestrial magnetic field is employed in the drive guide system. The direction sensor can be easily influenced by background noises in its surroundings. The background noise thus affects the detection of the direction of the terrestrial magnetism and thus causes errors in the calculation of the remaining distance and the direction to travel. Therefore, the variation of the background noise is sequentially monitored to detect the magnitude of the background noise affecting the detection of the direction, and when the variation exceeds acceptable limits, an error signal is produced.
REFERENCES:
patent: 3584388 (1968-05-01), Petrov
patent: 3903610 (1975-09-01), Heaviside et al.
patent: 4442609 (1984-04-01), Senoo
Chujo Satoru
Mitamura Kenichi
Haroian Harry N.
Nissan Motor Company Limited
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