Study And Selection Of Celestial Coordinate Transformation Strategies In Space Mining

Energy is the most basic driving force of human development and world economic growth,but with the high-intensity mining of mineral resources,the problem of mineral resource depletion is becoming increasingly serious,so human beings are facing a severe energy crisis.In order to solve the crisis,it is imperative to carry out space resource exploration.The research on the precise transformation of the coordinate reference frame is the premise and foundation of space resource exploration.This paper mainly analyzes the influence of various versions of Development Ephemeris on the transformation of celestial coordinates between the earth and other celestial,and the transformation of lunar fixed coordinates and lunar central coordinates.In addition,the three Euler angles of Lunar Libration are numerically integrated in the framework of relativity,and the influence of the relativistic effect on the transformation between the lunar fixed coordinates and the lunar central celestial coordinates is analyzed.Finally,this paper applies the quaternion method to the coordinate transformation scene of orbit coordinate system and fixed coordinate system,and analyzes the advantages of this method compared with the traditional two-step transformation method and one-step transformation method.The main researches as follow:1.This paper introduces the classification of coordinate reference frame in space mining,and the definition of each reference frame.The transformation methods from geocentric celestial coordinates to other celestial coordinates,from lunar fixed coordinates to lunar celestial coordinates,and from orbit coordinates to celestial fixed coordinates are introduced.2.According to the observation data and calculation methods used in different versions of ephemeris published by JPL,this paper analyzes the influence of JPL DE405,DE418,DE421,DE423,DE424,DE430,DE432 and DE435 ephemeris on the transformation of celestial coordinates between the earth and other celestial.The results show that DE430 ephemeris is preferred for the transformation of celestial coordinates between Earth and Moon,Venus,Mars,mercury,Uranus and Neptune.DE435 ephemeris is preferred for the transformation of celestial coordinates between Earth and Jupiter and Saturn.DE432 ephemeris should be preferred for the transformation of celestial coordinates between Earth and Pluto.In addition,when the difference in conversion parameters between other ephemeris and the optimal ephemeris is less than the uncertainty of the corresponding celestial body orbit estimation,according to the accuracy requirements of the celestial coordinate conversion,the ephemeris can be selected.3.In this paper,the influence of DE405,DE414,DE418,DE421,DE423,DE424,DE430 and DE431 ephemeris on the transformation of lunar fixed coordinates and lunar celestial coordinates is analyzed.The results show that DE430 ephemeris is preferred for the transformation of lunar fixed coordinates and lunar celestial coordinates.When the difference between other ephemeris and DE430 ephemeris is small,the corresponding ephemeris can be selected according to the accuracy requirements of coordinate transformation.4.In this paper,the motion equation of Euler angle of Lunar Libration under the framework of relativity is constructed,and three Euler angles considering the relativistic effect are calculated.The transformation of five lunar reflectors from lunar fixed coordinates to lunar celestial coordinates by using the three Euler angles is realized,and the influence of relativistic effect on the coordinate transformation is analyzed.The results show that the relativistic effect has little influence on the coordinates transformation in the past 30 years,and the calculation efficiency is low.Therefore,it can be ignored.However,when the accuracy of coordinate transformation is high,the relativistic effect should be considered.5.In this paper,the formulas of two-step transformation and one-step transformation from orbit coordinate system to celestial fixed coordinate system are given in detail.In view of the disadvantages that the accuracy of the above two methods is greatly affected by the accuracy of satellite orbit data,the quaternion method is applied to the coordinate transformation scene,and the three coordinate transformation methods are compared and analyzed.The results show that: when the accuracy of satellite orbit data is high,the one-step conversion method is the best;when the accuracy of satellite orbit data is not high,the quaternion method is the best;when the satellite orbit data in celestial fixed coordinate system can't be obtained,the two-step conversion method can only be used for conversion.There are 16 figures,15 tables,and 75 references in this thesis.