Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-02-24
1977-04-12
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
318653, 324 34PS, 324 41, 340258C, G01R 3302, G01S 102
Patent
active
040178587
ABSTRACT:
A field (e.g., a magnetic field) which nutates about a pointing vector is used to both track or locate an object in addition to determining the relative orientation of this object. Apparatus for generating such a field includes mutually orthogonal coils and circuitry for supplying an unmodulated carrier, hereafter called DC signal, to one coil and an AC modulated carrier signal, hereafter called AC signal, to at least one (usually two) other coil, such that the maximum intensity vector of a magnetic field produced by the currents in the coils nutates about a mean axis called the pointing vector direction of the field.
REFERENCES:
patent: 3121228 (1964-02-01), Kalmus
patent: 3838409 (1974-09-01), Minasy et al.
Berger Richard E.
Polhemus Navigation Sciences, Inc.
Wilbur Maynard R.
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