An Angular Velocity Phase-Based Attitude Observation Method for Self-Calibration in Fixed-Wing Airborne Dual-Axis RINS

This research article presents an improved approach to attitude observation, leveraging the angular velocity phase-based lever arm effect for self-calibration in dual-axis rotational inertial navigation system (RINS) deployed on fixed-wing aircraft. Initially, an analysis of the kinematics of fixed-wing aircraft is conducted to derive the relative observation errors caused by the nonunique angular velocity phase-based lever arm. Subsequently, a self-calibration scheme is established, predicated on the angular velocity phase-based relative attitude observation method. The proposed method is applied in the designed dual-axis RINS within the optical electronic pod to ascertain its efficacy. The results from the self-calibration experiments demonstrate that the calibration accuracy can be enhanced to 0.0003°/h ( $1\sigma $ ) in bias, and 0.69 ppm in scale factor when employing the proposed method, which substantiates the robustness and precision of the proposed method for the self-calibration of fixed-wing airborne RINS.