Acta Geodaetica et Cartographica Sinica ›› 2019, Vol. 48 ›› Issue (3): 303-312.doi: 10.11947/j.AGCS.2019.20180073

• Geodesy and Navigation • Previous Articles     Next Articles

Applicability analysis of the approximate model of the Earth with the arrangement of INS in polar region

LIN Xiuxiu, BIAN Hongwei, MA Heng, WANG Rongying   

  1. Electrical Engineering College, Navy University of Engineering, Wuhan 430033, China
  • Received:2018-03-12 Revised:2018-11-10 Online:2019-03-20 Published:2019-04-10
  • Supported by:

    The National Natural Science Foundation of China (Nos. 41876222;41506220)

Abstract:

The arrangement of horizontal coordinate system based on the Earth's second approximate ellipsoid model is complicated in polar region, the arrangement itself has the principle error, While the first approximate sphere model has geometric errors, it has simple arrangement in polar regions, and the geometric error is smaller than that in the middle and low latitudes. The selection of the Earth model is becoming more and more prominent with the intensive study of the inertial navigation in polar region. To solve this problem, based on the definition of the Earth approximate model, the system error equations of SINS based on the first approximate model of the Earth is derived. Then comparing the inertial error of the Earth approximate model with the simulation and analyzing the applicability of the Earth approximate model. The simulation results show that the geometric errors of the first approximate model will accumulate with time, while the errors of the second approximate model change little with time. When the inertial navigation run in a long time, the first approximate model of the Earth is no longer suitable for polar area.

Key words: polar navigation, error analysis of inertial navigation, Earth approximate model, Earth first approximation, Earth second approximation

CLC Number: