日月摄动对高精度惯导系统的影响

The influence of the sun-moon perturbations on high precision inertial navigation system

针对日月摄动对长航时高精度惯性导航的影响,对其引起的导航误差进行了研究。基于JPL星历DE405,建立了日地月系统的轨道模型,获得三者相对位置信息。利用此轨道模型求解出日月引力摄动对地球表面的惯性器件产生的比力最大达到0.15μg。同时开展了长航时高精度纯惯性导航仿真验证,结果显示日月引力摄动单日内最大可以引起米级的惯性导航定位误差,并在长航时导航中呈现出周期性。同时摄动对导航的影响随着纬度变化而变化,在30°附近影响相对较小,其产生的定位误差在超高精度惯性导航中需要予以考虑。

The influence of the sun-moon perturbations on the long-endurance high-performance inertial navigation is investigated for the navigation errors caused by it.Based on JPL ephemeris DE405,the orbit model of the Sun-Earth-Moon system is established and the relative position information of the three is obtained.The maximum gravitational perturbation from the Sun and Moon on an inertial device placed on the Earth's surface reaches 0.15μg.Simultaneously,a long-duration,high-precision pure inertial navigation simulation verification is conducted.The results show that within a single day,the gravitational perturbation from the Sun and Moon can cause positioning errors of the order of meters in inertial navigation.These errors exhibit periodicity during long-duration navigation.Additionally,the impact of perturbation on navigation varies with latitude,with relatively smaller effects near 30 degrees latitude.These perturbation-induced positioning errors should be considered in ultra-high-precision inertial navigation.