Research On Positioning Orientation Model Based On Astronomical Photogrammetry

The method of locating and orienting the celestial bodies is very effective in the environment where the satellite orientation is not adopted,and the orientation technology based on the astronomical photogrammetry is the development direction of the orientation antomation of astronomy.In this paper,we mainly study the orientation model based on astronomical photogrammetry,and the research work is as follows:(1)This paper systematically introduces the commonly used coordinate system,time system,the traditional method of astronomical orientation and various errors involved in astronomical navigation,and emphatically introduces the influence of the refraction correction on the celestial navigation and the correction model of the refraction correction.(2 This paper presents an algorithm for star map recognition in approximate station coordinate system,the azimuth and altitude angles of the stellar theory and the measured values are calculated respectively,and the object is identified by comparing the system difference,and the usability of the algorithm is verified by software simulation,and the comparison between the theoretical value and the measured value is obtained through MATLAB programming language drawing.It provides the basis for the subsequent calculation of the astronomical latitude and longitude of the station and the target orientation.(3)From the point of view of coordinate transformation,this paper deduces the orientation model based on astronomical photogrammetry,simplifies the measurement process,and does not need to read the horizontal azimuth and the vertical height angle of the precise object,simply use a photographic theodolite or camera to track and shoot a number of celestial bodies or a single celestial body,record the time of shooting and the posture of shooting,Can be located in the celestial orientation.When calculating the position parameters of the station,the Rodrigo Matrix algorithm is used to simplify the calculation process.In addition,in order to avoid the pathological problems when the single star is used to solve the orientation model,the disk Zopan right mode is used to prolong the filming time,which can not only improve the geometrical configuration,but also eliminate the error of the instrument system.Finally,the reliability of the model is verified by experiments.(4)According to the research model and algorithm,the experiment was carried out to shoot the sun and moon,and the reliability was verified by the solution,and the experimental results were analyzed.