Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1974-12-02
1976-02-17
Martin, Jr., William D.
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
G01C 1728
Patent
active
039382575
ABSTRACT:
A flux valve compass heading repeater system is provided with a compensating system which, when connected to a three-legged flux valve, provides fully compensated, three-wire output signals of the synchro data transmitter type for direct use in apparatus requiring precision three-wire heading data. The compensating system includes control circuits for generating sine and cosine components of magnetic heading and for compensating them for typical compass errors such as those induced by changes in operating latitude and two cycle and index errors. Latitude compensation is accomplished by a novel proportional automatic gain control; two cycle cardinal heading error compensation is accomplished by a compensation circuit having only a single manual control, while index error compensation is similarly accomplished by a compensation circuit requiring only a single manual control.
REFERENCES:
patent: 3548284 (1970-12-01), Espen
patent: 3678593 (1972-07-01), Baker et al.
patent: 3705980 (1972-12-01), Brickner et al.
Martin, Jr. William D.
Sperry Rand Corporation
Terry Howard P.
LandOfFree
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