Method used for paper chart correction

A correction method and chart technology, applied in the field of ship paper charts, can solve problems such as affecting the safety of navigation, affecting the accuracy of equipment plotting and indication, property loss, etc., and achieve the effect of improving the accuracy of coordinate picking.

Active Publication Date: 2017-08-11
TIANJIN NAVIGATION INSTR RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since paper charts cannot be placed manually to meet the requirements, paper charts will be deformed to a certain extent after long-term use
These factors will affect the accuracy of equipment plotting instructions. When the position plotting of the own ship and the target on the paper chart is inaccurate, it will affect the safety of navigation and cause property damage.

Method used

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  • Method used for paper chart correction
  • Method used for paper chart correction
  • Method used for paper chart correction

Examples

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Embodiment Construction

[0042] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0043]A method for correcting paper charts. The point at the lower left corner of the paper chart is taken as the first calibration point, and a point on the lower edge of the paper chart is the second calibration point. The second calibration point should be the distance from the first calibration point. point as far away as possible. Any point on the paper chart is the third calibration point. In order to ensure the accuracy of the calibration, it is recommended to use the upper right point of the chart as the third calibration point, which should be as far away as possible from the first two calibration points. figure 1 shown. The first calibration point and the second calibration point can complete the offset and rotation error correction generated when the chart is placed, and the third calibration point can complete the deformation error cor...

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Abstract

The invention relates to a method used for paper chart correction. The method is characterized in that the method comprises the following steps that excursions and rotation errors generated during the placement of a chart are corrected by two calibrated points; deformation errors of the paper chat are corrected by three calibrated points. According to the method, a distortional paper chart coordinate system or a coordinate system out of position in placing can form mapping with a coordinate system of actual placement, and when plotting a position coordinate of a plotting light dot or a paper chart pick point, through mapping transformation, the light dot plotting indication precision and the coordinate pick precision can be improved; through the selection of two position points, two sets of theoretical position coordinates and actual position coordinates are obtained, and the rotation errors and moving errors generated by placing the paper chart are achieved; through the selection of three position points, three sets of theoretical position coordinates and actual position coordinates are obtained, and the rotation errors, the moving errors and the deformation errors of the paper chart are completed.

Description

technical field [0001] The invention belongs to the technical field of ship paper charts, in particular to a method for correcting paper charts. Background technique [0002] During the actual navigation of the ship, it is necessary to plot the current position and target position of the ship on the paper chart through electronic equipment. When using a paper chart, it is necessary to place the paper chart at a specified position on the surface of the paper chart plotting device, so that the plotting device can plot the indication point on the correct position of the paper chart. After laying the paper chart on the specified position of the device, the device will correspond the latitude and longitude of each point of the paper chart to the surface position of the device according to the information of the paper chart to form a mapping relationship. After obtaining the longitude and latitude information of the own ship or the target ship, the computer calculates the point c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00G01C21/20
CPCG01C21/203G01C25/00
Inventor 孙高翔胡才兰晓阳
Owner TIANJIN NAVIGATION INSTR RES INST
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