Calibration and correction method of the output signals of the triaxial accelerometer
Keywords:Navigation sensors, Accelerometers, Calibration, Output signals correction, Allan variation
Background. Calibration is one of the most important stages of work for putting into operation such navigation sensors as accelerometers.
Objective. The aim of this study is to investigate the possibility of using the calibration and correction method of the output signals of the triaxial accelerometer.
Methods. To work with the model outputs matrix methods of linear algebra are used. In particular, determining the unknown parameters of the model is based on the method of least squares. Correction algorithm is given in the form of a matrix notation for solving system of linear equations. Such methods of mathematical statistics as the standard deviation and the mathematical expectation were used for the output signals correction estimation.
Results. Formulas for calculations of calibration parameters were obtained, and correction link for output accelerometer signals was developed. Experimental calibration was organized and the data obtained by the algorithm of calibration and correction link was processed. The results of studies for several test samples of triaxial accelerometers are presented.Conclusions. Using the calibration coefficients, which combine error scale factors and non-orthogonal axes errors can significantly reduce the computational load on the electronic signals processing unit and make output signals with a satisfactory accuracy.
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