Magnetic compasses

Boots – shoes – and leggings

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Details

33356, 340347P, 364559, G01C 1728, G06F 1520

Patent

active

041797418

ABSTRACT:
A static compass capable to supply a digital indication of the magnetic h angle, comprising circuits for supplying two signals corresponding to two orthogonal components of the horizontal component of the earth magnetic field, said signals consisting of a carrier frequency, amplitude modulated according to the value of said orthogonal components, a circuit for introducing a phase shift through 90.degree. electric on one of said modulated frequencies, a circuit effecting the sum and the difference of said two signals, a circuit for measuring the difference of phase between said sum and difference signals and for introducing count pulses in a number proportional to said difference of phase in order to drive digital counters associated to digital display elements showing the head angle with respect to the horizontal component of the earth magnetic field, further including apparatus for indicating the error with respect to a selected head angle, said apparatus including an arrangement for manually entering and memorizing said head angle, a counter predisposed for counting in amplitude and sign the error between the measured head angle and the selected angle, and an analogic/digital display arranged so as to indicate the amount, the direction and the variation in time of the error between the measured orientation and the orientation as set and memorized.

REFERENCES:
patent: 3555541 (1971-01-01), Egerton et al.
patent: 3746842 (1973-07-01), Fowler
patent: 3851330 (1974-11-01), Huber
patent: 3878535 (1975-04-01), Twiss
patent: 3918044 (1975-11-01), Alpatoff et al.
patent: 3938257 (1976-02-01), Erspamer
patent: 3975621 (1976-08-01), Fowler
patent: 3991361 (1976-11-01), Mattern et al.
patent: 4032758 (1977-06-01), Lewis
patent: 4038528 (1977-07-01), Fowler

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