Nonlinear least square tri-axial vector sensor high-precision correction method

Abstract

The invention relates to a nonlinear least square tri-axial vector sensor high-precision correction method. Influences of three aspects including tri-axial non-orthogonality, calibration coefficient inconformity and zero polarization on a measured value are comprehensively considered to obtain a sensor error correction model having the common applicability on common tri-axial vector sensors; a high-precision scalar ambient field measurement instrument is introduced to provide expected output; a tri-axial vector sensor intrinsic parameter identification optimizing model is further built; the basic idea of a nonlinear least square is combined to solve the model to achieve tri-axial vector sensor intrinsic parameter identification and error correction. Compared with the prior art, the high-precision correction method has the advantages that the common applicability for the common tri-axial vector sensors is achieved, the influences of the tri-axial non-orthogonality, the all-axial calibration coefficient inconformity and the zero polarization on the measured value are comprehensively considered, influences of instrument system errors on the measured value are removed, and requirements for experiment operation and instrument equipment are not high.

Description

technical field [0001] The invention belongs to the technical field of electronic instrument measurement, calibration and correction, and relates to a high-precision correction method of a nonlinear least squares three-axis vector sensor Background technique [0002] The three-axis vector sensor can realize not only the scalar measurement of the space physical field but also the vector measurement, which has unique advantages and wide application in actual measurement work. However, due to the limitation of processing and installation technology, the sensitive elements of each measurement axis of the actual three-axis vector sensor are not completely orthogonal, and the sensitivity of each axis and the electrical performance of the excitation amplifier circuit are also different. There is a large error between the measured value of the sensor and the actual value, which greatly limits the application field of the three-axis vector sensor. Therefore, in high-precision measur...

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Problems solved by technology

For the identification of the inherent parameters of the sensor, a high-precision scalar background field measuring instrument is introduced to provide the expected output, so as to make up for the inadequacy of the system error caused by the measurement data provided by the calibrated instrument. Further, according to the nonlinear least squares calculation Requirements, establish an optimal model for the identification of the inherent parameters of the three-axis vector sensor; combine the basic idea of ​​nonlinear least squares to solve the model, and realize the identification and error correction of the inherent parameters of the three-axis vector sensor

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