Method for determining azimuthal direction relative to true nort

Details Method for determining azimuthal direction relative to true nort Method for determining azimuthal direction relative to true nort

1973-09-14

1976-02-10

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

Process

33324, G01c 1938

Patent

active

039369480

ABSTRACT:
Disclosed herein is a method for determining azimuthal direction relative to true north using gyroscopic apparatus. The input axis of a gyroscope is rotated at a substantially constant rate about the local vertical axis. A series of precessional rates at the gyroscope's output axis is measured as the input axis rotates through a predetermined portion of each half revolution. The predetermined portion of each half revolution of the input axis is in known relationship to the heading or reference being determined. Each difference in successively measured ones of the series of precessional rates is filtered to reduce the effect of drift within the gyroscope and thereby accurately determine the azimuthal direction of such heading relative to true north.

REFERENCES:
patent: 3222795 (1965-12-01), Gevas
patent: 3330945 (1967-07-01), Gevas
patent: 3561129 (1971-02-01), Johnston
patent: 3753296 (1973-08-01), VanSteenwyk

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