【摘要】 直接敏感地平和利用星光折射间接敏感地平是两种基于天体敏感器的自主天文导航方法,其定位精度主要取决于地平的敏感精度。通常利用红外地平仪直接敏感地平的方法简单、可靠,但精度较低,而近年出现的利用星光折射间接敏感地平的方法精度高,但必须能观测到符合一定条件的折射星,根据上述两种方法的特点,提出了一种基于信息融合的直接敏感地平和利用星光折射间接敏感地平相结合的自主天文导航的新方法,计算机仿真结果表明该方法可以进一步提高系统的精度和可靠性。更多还原

【Abstract】 Directly sensing horizon and stellar horizon atmospheric refraction are two kinds of autonomous celestial navigation method.They both use the extended Kalman filter and the measurement of angle between celestial bodies estimate the position and velocity of spacecraft.There are different level of autonomy,error sources,benefits and limitations of these two methods.Due to the different characteristic of them,this paper presents a new method of autonomous celestial navigation using both of the two methods based on information fusion.Simulation shows a better result of position determination of spacecraft.更多还原