Measuring and testing – Navigation – Take-off and landing monitors
Patent
1976-12-20
1978-09-12
Kunin, Stephen G.
Measuring and testing
Navigation
Take-off and landing monitors
33356, 318633, G01C 2100
Patent
active
041127544
ABSTRACT:
The invention relates to an apparatus for compensating the output signals from a pendulous induction compass transmitter to eliminate heading errors during turns due to the vertical component of the Earth's magnetic field as well as those due to the horizontal component of the Earth's magnetic field perpendicular to the axis of tilt, i.e., two cycle error. By compensating for the effect of Earth's vertical field component, instabilities and anomalies such as "Northerly Turning Error" are eliminated or minimized. Compensation for vertical field error is achieved by generating a signal proportional to the product of the Earth's magnetic field M, the sine of the magnetic dip angle D at the given latitude and longitude and the sine of the aircraft bank or roll angle .phi.. This signal is combined (by summation) with the demodulated signal from the sin .psi. channel (i.e., the signal from the windings of the compass transmitter which senses the field along the athwartships axis) to cancel vertical error. Similarly, a signal proportional to the cosine of the aircraft bank or roll angle .phi. is generated and combined with the corrected DC signal from the compass transmitter to cancel two cycle error. Since the magnitude of the bank angle .phi. or its trigonometric functions, i.e., sin .phi. and cos .phi., can readily be obtained from the aircraft vertical gyroscope and the dip angle D is known for any latitude and longitude, these two compensating signals can easily be generated and applied to the output signal processing channels from the compass transmitter to cancel the effects of vertical field error and two cycle error during a turn.
REFERENCES:
patent: 3244961 (1966-04-01), Adler
patent: 3628254 (1971-12-01), Burmeister
patent: 3678593 (1972-07-01), Baker et al.
patent: 3939572 (1976-02-01), Erspamer
patent: 4006631 (1977-02-01), Garner
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