Vehicle location display device with averaging means for correct

Details Vehicle location display device with averaging means for correct Vehicle location display device with averaging means for correct

1986-01-30

1987-06-16

Karlsen, Ernest F.

Electricity: measuring and testing

Magnetic

Combined

324247, 324260, 33361, 364444, 364449, G01C 1728, G01G 728, G01R 3300

Patent

active

046738789

ABSTRACT:
A current location updating display for indicating the current location of moving members such as an automobile while updating from time to time based on output from a magnetic azimuth sensor adapted to detect the azimuth of terrestrial magnetism. Output signals from the magnetic azimuth sensor are stored in a data memory after A/D conversion and correction, and a predetermined amount of data read out from the data memory is subject to the averaging processing. With this, plural angle information (sin .theta. and cos .theta.) signals or plural angle (.theta.) signals are averaged out including a signal corresponding to disturbance magnetism. Thus average data signals are integrated by an integrator and then sent to a display portion. Through the averaging processing an azimuthal error is restrained as small as possible, so that the current location or running path of the moving member may be indicated correctly.

REFERENCES:
patent: 3835375 (1974-09-01), Rovner
patent: 4435760 (1984-03-01), Kuno et al.

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