Boots – shoes – and leggings
Patent
1986-11-04
1989-02-21
Chin, Gary
Boots, shoes, and leggings
364566, 36457103, 33318, 73504, G06G 778, G01C 1938
Patent
active
048071382
ABSTRACT:
The north direction shall be determined by a carrier fixed two-axis rate gyro having a substantially vertical spin axis from the two components of the horizontal component of the rotary speed of the earth. Deviations of the position of the rate gyro from an exact vertical alignment of the spin axis are detected by two accelerometers which provide acceleration signals. The ratio of acceleration signals and acceleration due to gravity provide values of the angles of inclination. Correction signals are formed out of the accelerometer signals and are subtracted from the signals obtained by the rate gyro. One of the correction signals compensates for the component of the vertical component of the rotary speed of the earth falling into the direction of the input axes of the rate gyro. Another signal compensates the rotary speed of the carrier relative to the earth and thus rotatory interferences. The tangent of the true azimuth angle is obtained by forming quotients of the rate gyro signals corrected in this way.
REFERENCES:
patent: 3763358 (1973-10-01), Cargille
patent: 4038527 (1977-07-01), Bradie et al.
patent: 4114437 (1978-09-01), Krogmann
patent: 4262861 (1981-04-01), Goldstein
patent: 4321678 (1982-03-01), Krogmann
patent: 4693114 (1987-05-01), De Carlo et al.
Black Thomas G.
Bodenseewerk Geratetechnik GmbH
Chin Gary
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