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- Position_fixing abstract "Position fixing is the branch of navigation concerned with the use of a variety of visual and electronic methods to determine the position of a ship, aircraft or person on the surface of the Earth.These techniques include: Position lines and position circles Celestial navigation Radio navigation Satellite navigation systemPositions may be expressed as a bearing and range from a known landmark or as an angles of latitude and longitude relative to a map datum.Generally speaking a position fix is calculated by taking into account measurements (referred to as observations) of distances or angles to reference points whose positions are known. In 2D surveys observations of three reference points are enough to compute a position in a two dimensional plane. In practice observations are subject to errors resulting from various physical and atmospheric factors that influence the measurement of distances and angles.A practical example of obtaining a position fix would be for a ship to take bearing measurements on three lighthouses positioned along the coast. These measurements could be made visually using a hand bearing compass, or in poor visibility electronically using radar or radio direction finding. Since all physical observations are subject to errors the resulting position fix is also subject to error. Although in theory two lines of position (LOP) are enough to define a point, in practice 'crossing' more LOPs provides greater accuracy and confidence, especially if the lines cross at a good angle to each other. Three LOPs are considered the minimum for a practical navigational fix. The three LOPs when drawn on the chart will in general form a triangle, known as a 'cocked hat'. The navigator will have more confidence in a position fix that is formed by a small cocked hat with angles close to those of an equilateral triangle. It is not true to say that the navigator's true position is 'definitely' within the cocked hat on the chart. The area of doubt surrounding a position fix is called an error ellipse. To minimize the error, electronic navigation systems generally use more than three reference points to compute a position fix to increase the data redundancy. As more redundant reference points are added the position fix becomes more accurate and the area of the resulting error ellipse decreases.The process of combining multiple observations to compute a position fix is equivalent to solving a system of linear equations. Navigation systems use regression algorithms such as Least squares in order to compute a position fix in 3D space. This is most commonly done by combining distance measurements to 4 or more GPS satellites, which orbit the earth along paths of predetermined position.".
- Position_fixing wikiPageID "491787".
- Position_fixing wikiPageLength "3166".
- Position_fixing wikiPageOutDegree "34".
- Position_fixing wikiPageRevisionID "663478692".
- Position_fixing wikiPageWikiLink Aircraft.
- Position_fixing wikiPageWikiLink Algorithm.
- Position_fixing wikiPageWikiLink Algorithms.
- Position_fixing wikiPageWikiLink Angle.
- Position_fixing wikiPageWikiLink Bearing_(navigation).
- Position_fixing wikiPageWikiLink Category:Geodesy.
- Position_fixing wikiPageWikiLink Category:Navigation.
- Position_fixing wikiPageWikiLink Category:Surveying.
- Position_fixing wikiPageWikiLink Celestial_navigation.
- Position_fixing wikiPageWikiLink Data_redundancy.
- Position_fixing wikiPageWikiLink Direction_finding.
- Position_fixing wikiPageWikiLink Earth.
- Position_fixing wikiPageWikiLink Electronics.
- Position_fixing wikiPageWikiLink Equilateral_triangle.
- Position_fixing wikiPageWikiLink GPS.
- Position_fixing wikiPageWikiLink Geodesy.
- Position_fixing wikiPageWikiLink Geodetic_datum.
- Position_fixing wikiPageWikiLink Global_Positioning_System.
- Position_fixing wikiPageWikiLink Hand_compass.
- Position_fixing wikiPageWikiLink Latitude.
- Position_fixing wikiPageWikiLink Least_squares.
- Position_fixing wikiPageWikiLink Lighthouse.
- Position_fixing wikiPageWikiLink Linear_equation.
- Position_fixing wikiPageWikiLink Linear_equations.
- Position_fixing wikiPageWikiLink Longitude.
- Position_fixing wikiPageWikiLink Map_datum.
- Position_fixing wikiPageWikiLink Navigation.
- Position_fixing wikiPageWikiLink Position_circle.
- Position_fixing wikiPageWikiLink Position_line.
- Position_fixing wikiPageWikiLink Radar.
- Position_fixing wikiPageWikiLink Radio_navigation.
- Position_fixing wikiPageWikiLink Satellite.
- Position_fixing wikiPageWikiLink Satellite_navigation.
- Position_fixing wikiPageWikiLink Satellite_navigation_system.
- Position_fixing wikiPageWikiLink Satellites.
- Position_fixing wikiPageWikiLink Ship.
- Position_fixing wikiPageWikiLink Surveying.
- Position_fixing wikiPageWikiLink Two-dimensional_space.
- Position_fixing wikiPageWikiLink Two_dimensional.
- Position_fixing wikiPageWikiLinkText "Position fixing".
- Position_fixing wikiPageWikiLinkText "fix".
- Position_fixing wikiPageWikiLinkText "position fix".
- Position_fixing wikiPageWikiLinkText "position fixing".
- Position_fixing wikiPageWikiLinkText "position".
- Position_fixing wikiPageWikiLinkText "positioning".
- Position_fixing wikiPageWikiLinkText "surveying".
- Position_fixing hasPhotoCollection Position_fixing.
- Position_fixing wikiPageUsesTemplate Template:Portal.
- Position_fixing wikiPageUsesTemplate Template:Unreferenced.
- Position_fixing subject Category:Geodesy.
- Position_fixing subject Category:Navigation.
- Position_fixing subject Category:Surveying.
- Position_fixing hypernym Branch.
- Position_fixing type Article.
- Position_fixing type Organisation.
- Position_fixing type Article.
- Position_fixing comment "Position fixing is the branch of navigation concerned with the use of a variety of visual and electronic methods to determine the position of a ship, aircraft or person on the surface of the Earth.These techniques include: Position lines and position circles Celestial navigation Radio navigation Satellite navigation systemPositions may be expressed as a bearing and range from a known landmark or as an angles of latitude and longitude relative to a map datum.Generally speaking a position fix is calculated by taking into account measurements (referred to as observations) of distances or angles to reference points whose positions are known. ".
- Position_fixing label "Position fixing".
- Position_fixing sameAs m.02gxj2.
- Position_fixing sameAs Q17141319.
- Position_fixing sameAs Q17141319.
- Position_fixing wasDerivedFrom Position_fixing?oldid=663478692.
- Position_fixing isPrimaryTopicOf Position_fixing.