Grid equiangular air line applicable to polar navigation and design method thereof

Abstract

The invention relates to the technical field of marine technology and navigation, and particularly provides a grid equiangular air line applicable to polar navigation and a design method thereof. Thegrid equiangular air line is defined as a curve intersecting with all grid heading reference lines to form fixed included angles on the ellipsoid face of the globe. The invention provides a specific air line equation and grid heading angle calculating method. The air line voyage is short, grid heading angles on the air line are equal, the air line is shown as a straight line on a polar spherical projection drawing, the air line can be strictly applied in cooperation with the grid navigation method and polar spherical projection and is more suitable for polar navigation.

Description

technical field [0001] The invention relates to the fields of navigation technology and navigation technology, in particular to a grid equiangular route suitable for navigation in polar regions and a design method thereof. Background technique [0002] The isometric route is usually used in navigation in middle and low latitudes, but as the latitude increases, the curvature of the conformal route is larger and the voyage is longer, so it is no longer suitable for navigation in polar regions, and great circle routes are usually used for navigation in polar regions. However, problems such as rapid changes in geographic heading angles and large orientation errors in polar regions on the great circle route are not conducive to navigation control in polar regions. For this reason, in 1941, Lieutenant Colonel Maclure of the British Royal Air Force combined polar spherical projections to propose polar region grid navigation technology. The combination of great circle route, grid na...

AI Technical Summary

Problems solved by technology

[0003] 1. The great circle route is projected as a non-linear line on the polar spherical projection map, which will cause inherent principle errors in navigation drawing calculations;

[0004] 2. Grid heading angles are used for the polar heading, and the grid heading angles on the great circle route are not equal. The irregular changes of the grid heading angle on a single route are bound to be unfavorable to navigation control;

[0005] 3. Strictly implement the great circle route, which can only be implemented by track rudders, and cannot be implemented by using course rudders according to the rules of equal course angles like in low and middle latitude areas;

[0006] 4. The great circle route is based on the spherical model of the earth, and there will inevitably be principle errors caused by the use of the earth model

[0007] Therefore, the great circle route, grid navigation technology and polar spherical projection cannot achieve precise coordination and application in the strict sense

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