Portable surveying compass with flux valve and gyrocompass align

Details Portable surveying compass with flux valve and gyrocompass align Portable surveying compass with flux valve and gyrocompass align

1977-01-10

1978-08-29

Martin, Jr., William D.

Geometrical instruments

Straight-line light ray type

Combined

33327, 33354, G01C 1938, G01C 102

Patent

active

041093917

ABSTRACT:
A miniature automatically self-aligning azimuth reference employs a floated pendulous gyrocompass device for the rapid determination of geographic north as required for surveying purposes. Fast approximate alignment with north from an initially misaligned condition is effected, while the gyroscope rotor is being run up to speed, using flux valve control. The control is then shifted to a gyrocompassing mode including settling, integration, and driving steps which complete precise alignment.

REFERENCES:
patent: 3162951 (1964-12-01), Hintze et al.
patent: 3452443 (1969-07-01), Arthur
patent: 3780444 (1973-12-01), Taylor
patent: 3837086 (1974-09-01), James
patent: 3858328 (1975-01-01), La Rose
patent: 3921305 (1975-11-01), King, Jr. et al.
patent: 3967384 (1976-07-01), Swartz et al.

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