Initial Alignment for SINS Based on Pseudo-Earth Frame in Polar Regions.
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An accurate initial alignment must be required for inertial navigation system (INS). The performance of initial alignment directly affects the following navigation accuracy. However, the rapid convergence of meridians and the small horizontal component of rotation of Earth make the traditional alignment methods ineffective in polar regions. In this paper, from the perspective of global inertial navigation, a novel alignment algorithm based on pseudo-Earth frame and backward process is proposed to implement the initial alignment in polar regions. Considering that an accurate coarse alignment of azimuth is difficult to obtain in polar regions, the dynamic error modeling with large azimuth misalignment angle is designed. At the end of alignment phase, the strapdown attitude matrix relative to local geographic frame is obtained without influence of position errors and cumbersome computation. As a result, it would be more convenient to access the following polar navigation system. Then, it .....
Maturity LevelPilot or Demonstrated
Spatial CoveragePolar Regions
CitationGao, Y., Liu, M., Li, G., & Guang, X. (2017) Initial Alignment for SINS Based on Pseudo-Earth Frame in Polar Regions. Sensors, 17:1416, 21pp. DOI: https://doi.org/10.3390/s17061416
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