RU2000122591A

RU2000122591A - METHOD FOR DETERMINING AND COMPENSATING THE INCLINOMETER MAGNETIC DEVIATION

Info

Publication number: RU2000122591A
Application number: RU2000122591/03A
Authority: RU
Inventors: Андрей Александрович Сидоров; Владимир Яковлевич Харбаш; Сергей Викторович Шурыгин
Original assignee: Общество с ограниченной ответственностью предприятие "АРКОН"
Filing date: 2000-08-28
Publication date: 2002-07-20

Claims

A method for determining and compensating for the own magnetic deviation of an inclinometer using a triaxial induction sensor in the entire sphere of rotation of the inclinometer, which includes the steps of: determining the deviation of the azimuth during calibration, approximating the deviation of the azimuth from the calibration results by the harmonic Fourier series (including determining the coefficients of the series by any suitable method, for example , by the method of least squares), compensation of the deviation error of the azimuth in the operating mode of the inclinometer is algorithmically calculated in The analyzer, characterized in that the azimuth deviation error is determined during calibration depending on all three inclinometer orientation angles (azimuth, longitudinal rotation and zenith), is approximated by a continuous dependence directly on the longitudinal rotation angle by the Fourier harmonic series up to the seventh order:

where γ is the angle of longitudinal rotation of the inclinometer (deg);
ΔΨ - azimuth correction (degrees);
A ₀ , A ₁ ,. . . A ₁₄ - approximation coefficients determined by the well-known least squares method [3],
why the inclinometer is set to the required azimuth and its rotation around the longitudinal axis is ensured, while the measurement results are continuously recorded for subsequent processing, then it is approximated by a continuous dependence not explicitly on the azimuth angle of the Fourier harmonic series of no less than fifth order:

. . .

where Ψ _y is the azimuth of the inclinometer, determined according to the installation scale (true);
B _0.0 , B _1.0,. . . , B _10.14 - approximation coefficients describing the dependence of the coefficients A ₁ , A ₂ ,. . . , A ₁₄ , and hence the azimuth errors from the azimuthal orientation of the inclinometer, determined by the known least-squares method [3],
for this, the inclinometer is set to various azimuths alternating through 30 ^o and the above operation is performed to determine the dependence of the error on the angle of longitudinal rotation, while the measurement results are also continuously recorded for subsequent processing, then it is approximated by a relay (step) dependence of the error on the zenith angle, for which, at various zenith angles alternating through 10-15 ^o , the two above-described operations are performed to determine the dependence on the azimuth and the angle of longitudinal rotation, at the same time, at each zenith angle, a corresponding set of coefficients В _0,0 , B _1,0 , is formed. . . , B _10.14 , stored in the configuration file, with which later, during operational measurements, the correction to the determined azimuth is introduced depending on the zenith angle by selecting a set of coefficients B _0,0 , B _1,0,. . . , B _10.14 from the configuration file, after which the dependence on the azimuth is determined by substituting the coefficients B _0,0 , B _1,0,. . . B _10.14 in the formula:

. . .

where Ψ _and is the azimuth measured by the inclinometer, taken from the previous measure, adjusted at the previous measure, then the dependence on the angle of longitudinal rotation by substituting the coefficients A ₁ , A ₂ ,. . . , A ₁₄ in the formula:

where γ is the angle of longitudinal rotation of the inclinometer, and the found correction ΔΨ is further taken into account in the readings of the inclinometer, so that using this method it is possible to achieve high accuracy in azimuth measurement for any spatial position of the inclinometer.