Rotation type grid inertial navigation level damping method based on damping network

Abstract

The invention discloses a rotation type grid inertial navigation level damping method based on a damping network, and belongs to the technical field of inertial navigation systems. On the basis of a mechanical layout of grid inertial navigation, for effectively inhibiting the adverse effect of a constant error of an inertial device on the navigation precision, a single-axis rotation modulation grid inertial navigation system suitable for a polar region is designed; and in order to effectively inhibit the adverse effect of a random error of the inertial device on the navigation precision, an outer level damping algorithm of the single-axis rotation modulation grid inertial navigation system suitable for the polar region is designed. A grid inertial navigation system resolving model, a single-axis rotation modulation technology and an outer level damping technology are combined, so that a navigation error, accumulated with time, of the grid inertial navigation system caused by an error of an inertial measurement assembly can be effectively inhibited, and the navigation precision of a ship during sailing in the polar region is improved.

Description

technical field [0001] The invention belongs to the technical field of inertial navigation systems, and in particular relates to a rotary grid inertial navigation horizontal damping method based on a damping network. Background technique [0002] The essence of the undamped inertial navigation system is a critically stable system. Under the excitation of constant value error source, the system will produce periodic oscillation error, and its amplitude is not attenuated. Under the influence of random error sources, the amplitude of the periodic component in the system error will increase with time. For inertial navigation systems that work for a long time, such as ship inertial navigation, such divergent errors will seriously affect their navigation and positioning capabilities. Therefore, in order to improve the accuracy of inertial navigation, the method of damping is generally used to suppress and attenuate the oscillation error. The usual practice is to add a correctio...

AI Technical Summary

Problems solved by technology

However, there are generally two main problems in this traditional damping method: 1) It is difficult to determine the parameters of the damping network, and repeated attempts are required; 2) When switching from the undamped state to the damped state, it will bring a large overshoot error

[0003] Due to the convergence of geographic meridians, geomagnetic force lines, and magnetic field anomalies in polar regions, the traditional magnetic compass-based aircraft positioning and orientation methods are no longer suitable for aircraft navigation in polar regions

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