Magnetic direction finding device with improved accuracy

Details Magnetic direction finding device with improved accuracy Magnetic direction finding device with improved accuracy

1988-02-10

1989-05-09

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324208, 324247, 364559, 34087032, G01B 714, G01S 302

Patent

active

048292508

ABSTRACT:
A system for determining the relative orientation in three dimensions between a fixed frame of reference and an unconstrained object. Mutual coupling between three orthogonally disposed transmitting coils driven by a multifrequency source and three orthogonal receiving coils produce sets of analog voltages which are sampled; digitized and processed using a fast fourier transform device to yield directional components for determining the pitch and yaw angles about a line-of-sight axis. By using a multi-frequency source to drive the transmitting coils and by deriving coordinate component measurements to at least two discrete frequencies, errors in the results due to eddy currents in surrounding conductive structures can be compensated for.

REFERENCES:
patent: 3937078 (1976-02-01), Williams
patent: 4054881 (1977-10-01), Raab
patent: 4287809 (1981-09-01), Egli
patent: 4396885 (1983-08-01), Constant
patent: 4584577 (1986-04-01), Temple
patent: 4642786 (1987-02-01), Hansen
patent: 4646013 (1987-02-01), Tornblom
patent: 4688037 (1987-08-01), Krieg

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