Six-position rotation rate calibration and piecewise linear interpolation compensation for INS in full temperatures

For decreasing measurement error of inertial navigation system(INS), a novel scheme was proposed in which a six-position rotation calibration and piecewise linear interpolation compensation in full temperatures. A six-position rotation rate calibration experiment was implemented in a series of constant temperature. Moreover, a piecewise linear interpolation algorithm was used to compensate for bias and scale factor temperature errors of gyroscopes and accelerometers, and to improve the measurement precision of INS. The experimental results show that the inertial navigation average errors are reduced to 0.393 n mile/h and 0.681 n mile/h from 1.501 n mile/h and 5.811 n mile/h for vehicle and airborne experiments. The proposed method is helpful to further improving image resolution of synthetic aperture radar (SAR).