| Navigation technique has an important place in deep space exploration and manned spacecraft, because the existing spacecraft navigation usually relies on the ground, there are existences of a large quantity of data to deal with difficultly and vulnerable to interference. in order to avoid these problems, stellar autonomous navigation as an important autonomous navigation method, by virtue of its high accuracy ,strong anti-interference ability has become focus of the study by the economic and military power ,since the start of study, china's autonomous navigation technology is relatively backward ,due to the high input and high risks for space experiments, using the simulation technology to study the star autonomous navigation generally ,and by constructing a system of stellar autonomous navigation to provide a basic test environment .In this paper, study the technology of the star navigation–related modeling, through using technology of simulation to achieve a system of stellar autonomous navigation, the main results of the studies and research have five points.(1) Explain the features of stellar autonomous navigation system, in accordance with the requirements of visual simulation ,design scalability and reusability of the framework of the system, and according to the characteristics of the system architecture to divide the functional module of system(2) According to the orbital dynamics of spacecraft, considering the influence of perturbations forces caused by the non-spherical gravitational potential, the atmospherics drag, the solar pressure and the third body gravitation, then establish precise orbit perturbation model of spacecraft, as well as, establish the state and measurement equations of autonomous navigation.(3) the SAO star catalog is selected as a basic catalog, simplifying the SAO star catalog, by extracting the Longitude, Declination, magnitude and proper motion, based on the simplified star catalog, guide star catalogue is set up, in order to reduce the match star and improve the star pattern recognition rate, present a method of establish a match star catalog based on the view field of star sensor.(4) Based on the real-time location of spacecraft, the model of View Field of Star Sensor is established, in order to withdraw the observation star high precisely, a new fractional step method for extracting observation from star catalog is presented, after a series of space coordinate transformation; the star map of current location is generated by computer simulation.(5) Improved the former algorithms of scanning star-map, by using the algorithms of triangle recognition, which takes the main star-pair as a common side, to recognize the observed stars, and test the success rate of the recognition algorithm. The results show the recognition rate of the algorithm is over 90%.The Visual Simulation System of stellar autonomous navigation is achieved based on these studies, by compared with the result of the orbital dynamics of spacecraft; check the precision of system of stellar autonomous navigation. Results show that the system with high accuracy. |
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