Digital compass having a ratiometric bearing processor

Details Digital compass having a ratiometric bearing processor Digital compass having a ratiometric bearing processor

1982-05-10

1983-11-01

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33363R, G01C 1728

Patent

active

044123876

ABSTRACT:
A digital compass including a two-axis earth's magnetic field sensor and a earing processor computes the bearing for local display or transmission from a remote site to a local site for display and/or storage. The bearing processor portion of the digital compass includes an analog-to-digital converter configured for ratiometric measurements to compute the ratio of the x-axis and y-axis signals (smaller divided by the larger) from the aforementioned two-axis earth's magnetic field sensor. A programmable memory unit controlled, inter alia, by the data line outputs of the analog-to-digital converter, contains the arc tangent function for angles from 0.degree. to 90.degree.. The data line outputs from the memory unit defines a quadrant displacement angle in the range of 0.degree. to 90.degree. which is subsequently added to the cardinal point forming the lower boundary in bearing of the host quadrant.

REFERENCES:
patent: 3601899 (1971-08-01), Artz
patent: 3905121 (1975-09-01), Takeda et al.
patent: 3942257 (1976-03-01), Erspamer
patent: 3952420 (1976-04-01), Benjamin et al.
patent: 3959889 (1976-06-01), Thomas
patent: 3971981 (1976-07-01), Nakagome et al.
patent: 4095348 (1978-06-01), Kramer
patent: 4267640 (1981-05-01), Wu
patent: 4379366 (1983-04-01), Kuno et al.

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