The Research Of Handle Calculator For Ship's Astronomy Positioning

Astronomical navigation positioning means the technology which observing the stars to judge the ship's position,it also be called celestial navigation or nautical astronomy.Astronomical positioning system is a self-contained system that does not require ground equipment,it is not be disturbed by the people or naturally occurring electromagnetic fields,not eradiate electromagnetic wave,has the high orientation accuracy and position accuracy,positioning error is independent of time,therefore,celestial navigation is widely used.Using the widely shooting angle of fisheye-lens to get more stars' orientation at the same time,it is more convenience and accurate than traditional sextant at measuring the stars' altitude.Remedying the defect which sextant can' t measure multistars' altitude at the same time.Finally,merging these technology to work out the astronomical navigation positioning calculator,the operation is simple,moreover it's convenience to bring,positioning the ships' location quickly.This paper adopt the principle of spherical trigonometry to solve the ship's position.Derive the positioning algorithm of single-star(sun?moon)?double-star(stars)and three-star,then establish the mathematical model of three main positioning algorithm,that is:single-star positioning model ? double-star positioning model ? three-star positioning model.Having deeply analysis in measurement,calculation and plotting in traditional astronomical positioning.Qualitative or quantitative analysis the reason and effect caused by different errors.Using error correction method and error compensation method to minimize the measure error and theory error in calculation.Meanwhile,minimize the effect of system error on the ship positioning accuracy.Navigation positioning can't rely on satellite navigation and positioning system completely,such as GPS system,Gallieo Satellite Navigation System or Beidou navigation system.With the application of science and technology in astronomy positioning and optimizing in the astronomical positioning theory development,astronomy navigation will be another effective complement for satellite navigation and positioning.When a failure in satellite positioning occurs,astronomy navigation calculator can be effective to ensure ship's navigational safety.