Self-calibration method of the inner lever-arm parameters for a tri-axis RINS. (17th October 2017)

• Record Type: Journal Article
• Authors: Song, Tianxiao; Li, Kui; Sui, Jie; Liu, Zengjun; Liu, Juncheng
• Is Part Of: Measurement science & technology. Volume 28:Number 11(2017:Nov.)
• Publication Date: 2017-10-17
• Subjects: inner lever-arm parameters -- tri-axis RINS -- self-calibration -- variable angular rate rotation scheme; Physical measurements -- Periodicals; Scientific apparatus and instruments -- Periodicals; Equipment and Supplies -- Periodicals; Science -- instrumentation -- Periodicals; Technology -- instrumentation -- Periodicals; Mesures physiques -- Périodiques; Physical measurements; Scientific apparatus and instruments; Periodicals; 502.87
• DOI: 10.1088/1361-6501/aa8758
• Languages: English
• ISSNs: 0957-0233

Abstract

Abstract: A rotational inertial navigation system (RINS) could improve navigation performance by modulating the inertial sensor errors with rotatable gimbals. When an inertial measurement unit (IMU) rotates, the deviations between the accelerometer-sensitive points and the IMU center will lead to an inner lever-arm effect. In this paper, a self-calibration method of the inner lever-arm parameters for a tri-axis RINS is proposed. A novel rotation scheme with variable angular rate rotation is designed to motivate the velocity errors caused by the inner lever-arm effect. By extending all inner lever-arm parameters as filter states, a Kalman filter with velocity errors as measurement is established to achieve the calibration. The accuracy and feasibility of the proposed method are illustrated by both simulations and experiments. The final results indicate that the inner lever-arm effect is significantly restrained after compensation by the calibration results.