Magnetoresistive Sensor Error Compensation Method Using Geometry-Constraint Contour Scaling

The magnetoresistive sensor strapped to the projectile is easily disturbed in highly dynamic environments, which has the problem of low accuracy for sensitive geomagnetic signals. In this article, a magnetoresistive sensor error compensation method using geometry-constraint contour scaling is proposed. A benchmark ellipsoid is obtained based on a two-step method. The shortest distance between any measured single point and the benchmark ellipsoid is calculated, and its position distribution relative to the benchmark ellipsoid is determined. The general form of the benchmark ellipsoid is converted into the standard form. The contour is scaled according to the shortest distance, and the single-point ellipsoid is obtained. The calibration parameters are extracted so that the single-point error compensation can compete. Simulation and experiment results show that the compensation accuracy of the proposed method is improved by two orders of magnitude compared with the traditional method.