基于天文/GPS的HEO卫星自主导航方法

为了实现大椭圆轨道(HEO)卫星高精度自主导航，提出一种将直接敏感地平天文导航与全球定位系统(GPS)相结合的组合导航方法.首先，分析卫星轨道??2运动模型及其所受空间摄动，建立卫星轨道动力学模型；然后，分析单一使用天文导航和GPS的优缺点，根据HEO卫星对GPS的可见性，提出在远地点只采用天文导航，而在近地点采用以天文导航为主、适时引入GPS信号进行位速测量辅助修正的方法.通过计算机仿真和结果分析表明了所提出的设计方法导航精度比单一天文导航提高72.4%～85.6%.

Autonomous navigation method of high elliptical orbit satellite based on celestial navigation and GPS

In order to realize autonomous and continuous navigation information outputs for high elliptical orbit(HEO) satellite, new integrated navigation system is proposed based on celestial navigation of directly sensing stellar and global positioning system(GPS) navigation. Firstly, satellite orbit motion model is established on the satellite orbit dynamics J₂ model and suffered space perturbation. Moreover, performances of single-use celestial navigation or GPS are analyzed. When the satellite is near the apogee, observation system is established by using only celestial navigation. When the satellite is near the perigee, the estimate covariance is revised through incoming GPS signal to improve the celestial navigation estimate. The autonomous navigation system is designed and simulating. The results of computer simulation show that the navigation accuracy is improved by 72.4%∼85.6% compared with the celestial navigation method.