Calibration compensation method for triaxial vector sensor and biaxial vector sensor
A compensation method and sensor technology, applied in the measurement of electrical variables, the testing/calibration of speed/acceleration/impact measurement equipment, instruments, etc., can solve the problems of high equipment requirements, complex methods, and difficult implementation.
Inactive Publication Date: 2011-11-16
ZHONGBEI UNIV
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[0003] In order to solve the problems that the existing multi-axis vector sensor calibration compensation method does not take into account all the factors causing the measurement error, and the method is complicated, difficult to implement, and has high requirements for equipment, it provides a simple correction process and accurate correction results. Calibration compensation method of three-axis vector sensor and two-axis vector sensor
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[0065] Taking the calibration of three-axis vector accelerometer and two-axis vector magnetic sensor as examples below, the method of the present invention will be further described:
[0066] 1. Apply the calibration compensation method of the three-axis vector sensor of the present invention to calibrate the three-axis vector accelerometer
[0067] Let the measured acceleration output of the three-axis vector accelerometer be The theoretical acceleration output is Then there is a three-axis vector accelerometer measured acceleration output G m , Theoretical acceleration output G e The relational formula:
[0068] G m =KG e +G 0 (1-1)
[0069] i.e. G e = K -1 (G m -G 0 ) (1-2)
[0070] Among them, K is the error coefficient matrix, K -1 is the inverse matrix of the correction coefficient matrix-error coefficient matrix K, G 0 =[G 0x G 0y G 0z ] T is the zero bias of the three-axis vector accelerometer;
[0071] Error coefficient matrix K=K 1 K ...
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The invention relates to error correction of a vector sensor, in particular to a calibration compensation method for a triaxial vector sensor and a biaxial vector sensor, and solves the problems that the calibration compensation method of the existing multi-axial vector sensor fails to take all factors causing measurement error into account and the like. In the method, an error correction mathematical model of the vector sensor is built according to the relation of actually measured output Sm and theoretical output Se of the vector sensor, i.e. Sm=KSe + S0 and according to an error coefficient matrix K=K1K2, wherein, K1 and K2 are respectively a sensitivity error coefficient matrix of the triaxial vector sensor and a non-orthogonal error coefficient matrix among three measured axes; and an effective method is utilized to obtain correct zero-offset S0 and a correction coefficient matrix K-1 in the error correction mathematical model, and finally the error correction mathematical model of the measured vector sensor is obtained to carry out calibration compensation on the measuring result of the vector sensor. The method achieves calibration compensation taking into account of all the factors causing the measurement error of the multi-axial sensor, thus improving the accuracy of measuring results; and the method has concise and convenient process and no excessively high requirements on hardware equipment, thus being suitable for various vector sensors.
Description
technical field [0001] The invention relates to error correction of a vector sensor, in particular to a calibration compensation method for a three-axis vector sensor and a two-axis vector sensor. Background technique [0002] With the advancement of modern science and technology, many industrial fields have higher and higher requirements for measurement accuracy, so simple and accurate instrument calibration technology is very important. For a multi-axis vector sensor (generally refers to a three-axis vector sensor and a two-axis vector sensor), the accuracy of its measurement results is related to the zero offset error, sensitivity error, and The installation error is related; among them, the installation error of each single-axis sensor causes the measurement axis of each single-axis sensor to be non-orthogonal (the angle between the measurement axis of the single-axis sensor and the coordinate axis of the orthogonal coordinate system is generally between tens to several ...
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IPC IPC(8): G01P21/00G01R35/00
Inventor 李杰高丽珍刘俊张晓明杨玉华陈国彬李永慧崔星
Owner ZHONGBEI UNIV