中文摘要：

导航星优选是研究天文定位导航的前提。本文结合导航恒星选星对天文定位的影响,研究提出了基于STK软件的导航星模拟方法,并针对空天飞行器对天文观测时的条件约束,结合天文导航定位对导航星的要求,构建了适合不同飞行航迹的导航星库。基于所设计的导航星库,以空天飞行器为应用对象,结合其在轨段飞行轨迹参数,基于STK软件进行了天文导航定位仿真研究。在所设计的飞行器飞行航迹参数及可见星信息条件下,针对空天飞行器长航迹飞行运动特点,设计了3种不同的天文定位观测选星方案,并研究了不同选星方案下的天文导航定位性能。最后通过仿真验证表明所提出的导航星模拟和选星方法能有效满足空天飞行器对天文导航定位的要求。

英文摘要：

The optimization of identification guide star is the premise of celestial navigation system （CNS）. In this paper, concerning the influence of star selection on the celestial positioning, an identifica- tion guide stars simulation based on STK is developed. In allusion to the constraints of the aerospace vehicle （ASV） on the celestial observation, the guide star database is established by considering the requirements of the celestial navigation to the stars, which is suitable for different flight path. Combining with the in-orbit segment flight parameters of the aerospace vehicle, celestial positioning simulation research based on the star database is implemented with the use of STK. Under the conditions of the flight path data and the visible star information extracted, the several options of star selection are put forward, and the performances of celestial position using different kinds of star selection are analyzed according to space vehicle. At last, the simulation results show that the identification guide lection can effectively meet the requirements of the aerospace vehicle on celestial the long track of the aero- star simulation and star se- postttontng