Novel high-latitude navigation method based on ECEF system

By using a navigation method based on the ECEF system and a third-order error compensation algorithm based on the Picard series, the problems of low positioning accuracy and large error fluctuation in high-latitude inertial navigation systems are solved, achieving high-precision and high-stability navigation results.

CN122170849APending Publication Date: 2026-06-09THE PLA NAVY SUBMARINE INST
0 Cites 1 Cited by

Patent Information

Application Number
CN202610217227.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-15
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Traditional high-latitude inertial navigation systems suffer from low positioning accuracy, large error fluctuations, divergence of attitude matrix elements, and computational singularities in polar environments. Furthermore, the positioning accuracy and availability of GNSS are significantly reduced, making them unsuitable for the complex environments of high latitudes.

Method used

A navigation method based on the ECEF system is adopted. By establishing the transformation matrix between the geographic coordinate system and the geocentric-ground-fixed coordinate system, the discrete navigation solution equations for attitude, velocity and position are derived, and inertial navigation error compensation is performed. The error compensation algorithm of the third-order term of the Picard series is used to optimize the navigation results in high latitudes.

Benefits of technology

It effectively suppressed the calculation error of the inertial navigation system, improved navigation accuracy and stability, reduced the oscillation characteristics of attitude error, solved the fundamental accuracy loss problem in high dynamic environment, and ensured the continuity and stability of the navigation system in the transition region between polar and non-polar regions.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention provides a novel high-latitude navigation method based on an ECEF system, and belongs to the technical field of high-precision navigation. The invention aims to solve the problems of low positioning precision and large error fluctuation of the traditional grid coordinate system and abscissa system navigation algorithm in a high-latitude environment, and the problem of navigation interference easily caused by longitude convergence and high-latitude dynamic effect. The method comprises the following steps: establishing a transformation matrix between a geographic coordinate system and an earth-centered earth-fixed coordinate system; establishing a discrete navigation solution equation of an attitude direction cosine matrix, speed and position under an earth-centered earth-fixed coordinate system; establishing error equations of attitude errors, speed errors and position errors under the earth-centered earth-fixed coordinate system; performing S-domain transformation according to the error equation and converting to a time domain to obtain an inertial navigation error analytical expression under an earth-centered earth-fixed coordinate system; and obtaining an optimized high-latitude navigation result according to oscillation and divergence characteristics of the attitude error and the speed error presented by the inertial navigation error analytical expression.
Need to check novelty before this filing date? Find Prior Art