Research on initial precision alignment method of strapdown inertial navigation system

Gao, Weiwei; Wang, Hongyun; Fang, Dan; Wang, Yi; Zhang, Hongyan; Li, Yang

doi:10.1063/1.5116484

Cited by 2 publications

(1 citation statement)

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“…That is, in fact, to use the results of the fine initial alignment for all parameters except for the heading, giving preference here to the results of the coarse initial alignment. Further, to determine the refined Rodrigues-Hamilton parameters, and on their basis the AO/E matrix, it is advisable to return to the use of the method II described in this paper, replacing the calculation of ψ according to (17) with the result of coarse initial alignment. Finally, the presented simulation results demonstrate the expected high accuracy characteristics of the suggested approach, which correspond to the current level of world developments in this field of research [15][16][17][18].…”

Section: Discussionmentioning

confidence: 99%

The development and evaluation of a combined initial alignment algorithm for strapdown inertial navigation system

Afonin

Sulakov

Маамо

et al. 2022

J. Phys.: Conf. Ser.

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This paper proposes a combined initial alignment algorithm for strapdown inertial navigation system, in which the initial alignment is carried out in two stages during the process of preflight preparations while the aircraft is not moving. This method of initial alignment has the advantages of being conducted based on the Earth’s equatorial (Greenwich) coordinate system, which is also used by the aircraft onboard navigation system. In the first stage, the coarse initial alignment is carried out, and this is done according to the orientation parameters using the vector matching method. Then, in the second stage, a fine procedure is carried out, which may be looked at as an integrated system implemented using optimal Kalman filter. In this case, the initial parameters of orientation and navigation are refined, as well as the systematic errors of the inertial sensors are estimated and corrected. The simulation results show that the required level of initial alignment accuracy could be achieved by applying coarse and fine initial alignment procedures not sequentially but in a combination.

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