Wind tunnel balance calibration model modeling method based on multivariate orthogonal function

The invention relates to a wind tunnel balance calibration model modeling method based on a multivariate orthogonal function, and belongs to the technical field of test aerodynamic measurement, and the method comprises the following steps: obtaining and solidifying a key parameter theta i1 based on unit calibration data, and processing multivariate calibration data by using a formula yi '= yi-theta i1 * xi; establishing a primary function model and orthogonalizing the primary function model to obtain a candidate orthogonal function model Ri; establishing a PSE-ASM criterion model, and screening multivariate orthogonal functions in the Ri to obtain a recommended orthogonal function model Ri '; solving a recommended orthogonal function model coefficient ai, and further solving to obtain a calibration model of the component; repeating the steps to obtain a balance multi-component calibration model; the modeling method based on the orthogonal multivariate function and the PSE-ASM criterion model is adopted, the p