Magnetic field interference correction of high-precision geomagnetic directional technology. (November 2021)

• Record Type: Journal Article
• Authors: Chen, Weiren; Zhang, Haifeng; Sang, Shengtian; Jiang, Ming; Chen, Yufeng; Liu, Xiaowei
• Is Part Of: Measurement. Volume 184(2021)
• Publication Date: 2021-11
• Subjects: Orientation estimation -- Geomagnetic direction -- Interference correction -- Total least squares -- Mahony algorithm; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2021.109940
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: A unified error model of the geomagnetic direction was established. The errors present at both ends of the linear equation were considered. The ellipsoid fitting method was used to verify the error compensation algorithm. A high-precision geomagnetic directional technology was achieved. Abstract: Low-cost magnetic and inertial sensors are extensively used for orientation estimation. However, magnetic sensors are very susceptible to environmental disturbance. In order to achieve accurate geomagnetic navigation, appropriate sensor correction procedures must be performed in advance to process measured data correctly. Therefore, a combined correction model and a high-precision geomagnetic directional technology were proposed in this work. Firstly, the working principle of the strapdown three-axis geomagnetic sensor was analyzed, and a unified calibration framework was established. Then, the total least square method (TLS) was utilized to solve all of the error parameters. Finally, a high-precision geomagnetic directional technology was achieved based on the Mahony algorithm. Experimental results revealed that the proposed technology significantly reduces the error amplitude and effectively compensates the data distortion, with higher and more stable compensation accuracy. The results prove the effectiveness of the proposed algorithm and its broad application prospects in military, industrial and civilian fields.