Ship great circle sailing track deviation determination method

Abstract

The invention discloses a ship great circle sailing track deviation determination method, which comprises the following five steps: the shortest distance between two points of an expected track is calculated; the shortest track distance between a starting point and the current position is calculated; auxiliary reference points on the expected track are found out; an auxiliary correction deviation angle is calculated; and the track deviation is calculated. A method of acquiring reference points on a planned track is adopted to obtain the track deviation, the ship can correct the sailing direction quickly, and the sailing time is really shortened; according to the determination method applied to the track deviation, the track deviation in the case of great circle sailing can be calculated in a more real-time and accurate mode, the ship track control precision is improved, sailing of the entire segment can be instructed and completed in a more economic and more reliable sailing route, and the purposes of energy conservation and emission reduction can be achieved.

Description

technical field [0001] The invention belongs to the technical field of ship track and course control, and in particular relates to a method for measuring the track deviation of a ship's great-circle navigation method. Background technique [0002] With the gradual commercialization of the GPS positioning system, track control is also gradually realized in the autopilot. If the ship can always approach the desired route during the voyage, it can not only reduce the track deviation and improve the navigation efficiency, but also save fuel and be low-carbon and environmentally friendly. [0003] The traditional method of calculating the track deviation of the great circle navigation method generally adopts a segmented method, that is, after the great circle route is divided into several segments, each segment is approximately regarded as an equal course line, and then the geometric relationship is used to solve the track deviation; the calculation of this method is relatively r...

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Problems solved by technology

[0003] The traditional method of calculating the track deviation of the great circle navigation method generally adopts a segmented method, that is, after the great circle route is divided into several segments, each segment is approximately regarded as an equal course line, and then the geometric relationship is used to solve the track deviation; the calculation of this method is relatively rough , the calculation accuracy has a strong dependence on the number of segments, and the more the number of segments, the higher the accuracy; however, there is no uniform standard for the selection of the number of segments, which generally depends on empirical selection, and there is a gap when the sailing distance is long. big error

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