The Position Calculation Of Marine Celestial Body And Automatic Star-choosing In Celestial Positioning

Celestial navigation is a Discipline that research on how to use the positions of celestial bodies to locate the ship’s position and navigate the ship at sea, it is an important branch of nautical navigation. Therefore, we must clearly make sure the visual position of celestial body, and inevitably involves selection of stars and calculating position of celestial ship. As the conventional method of celestial navigation is manually check the list to get of all datum and implement complicated calculations brings about inefficiency and precision limited. At present, the calculations and observations of position of celestial bodies and related technologies have been more mature, there are also many mature celestial motion theories abroad, which provides theory and technology basis for celestial navigation automatic calculation software.This thesis firstly describes the related concepts for celestial visual position calculation in detail, concluding the celestial coordinates, time and epoch, precession and nutation, the obliquity of the ecliptic and so on. According to the practical need of celestial navigation, exploration based on VSOP87theory of planetary motion and schedule data sun and navigational planet apparent position calculation model, based on the ELP2000and ELP/MPP02theory of the motion of the moon moon visual position calculation model and based on the FK5data files and the Hipparcos catalogue data file navigation calculation model in the apparent positions of the stars, the model fully consider the coordinate system conversion, precession, nutation, aberration, various amendments, the establishment of a set of high precision navigation celestial visual position calculation system. Based on the calculation precision of the model, shows that the calculating models fully meet the demand of accuracy of celestial navigation. The air apparent place of celestial body in the results for the basic data, the establishment of a scientific and rational automatic satellite selection model and observation positioning calculation model. Using Visual Basic6will be set up by the various models into modules, and comprehensive application development of celestial position calculation and selection of satellite positioning software. The software implementation of the navigation celestial visual position calculation, automatic selection of stars and manual recommended sun star, observation positioning automatic calculation, and compass errors and other functions, and can be carried out in practice application.This thesis mainly focus on research for the astronomical navigation calculation software and technical support as for reference.