Accuracy analysis based on dual-vectors in inertial space for mooring initial alignment

作者：Xu, Bo; Qiu, Limin; Zhang, Yi; Cao, Tong

来源：Journal of Computational Information Systems, 2014, 10(11): 4575-4584.

DOI：10.12733/jcis10187

• Dual-vector
• Dynamic environments
• Geocentric coordinates
• Inertial coordinate
• Initial alignment
• Reference vectors
• Simulation analysis
• Strap-down inertial navigation systems

It has great significance for strap-down inertial navigation system (SINS) to accomplish high-precision and quick self-alignment in dynamic environment without external sensors aided. Alignment based on inertial frame is a solution that has higher precision for SINS in mooring conditions with shaking and sways interference. In the method, two non-collinear vectors in space are proposed to accomplish attitude determine process during alignment. The two reference vectors are selected from the geocentric coordinate and inertial coordinate which will fulfill the requirement of alignment in dynamic conditions. By the feature that cone movement of gravity vector in inertial coordinates could determine the geographic north, and the relative attitude relationship between navigation coordinates and carriers is analyzed. After giving principles of the alignment method, this paper deeply analyzes the selection, the sampling time and the projection in inertial coordinate space of the dual vectors. And it also makes simulation analysis and experiment. The result indicates that the precision of this method improves within the first 12 hours. question. It verify the theoretical analysis and it is also a strong support for practical application.

• 出版日期2014
• 单位哈尔滨工程大学