近圆低轨卫星星座相位保持方法

主要研究无轨道高度保持要求的近圆低轨卫星星座相位保持方法.首先根据轨道摄动理论，推导了考虑J2摄动和大气阻尼摄动的卫星相位漂移模型，分别给出基于固定基准星和基于虚拟基准星的相位偏差两种表达方法.在此基础上，按照星座各星轨道衰减一致和不一致两种情况，分别提出两种表示方法理论的和考虑实际控制误差的相位保持策略.通过一个walker星座仿真算例验证了两种方法的有效性.仿真结果显示，两种方法在各星轨道衰减一致和不一致两种情况均可有效完成相位维持任务，当各星轨道衰减一致时两种方法在控制次数和控制总量上无明显差异；在各星轨道衰减不一致情况下，基于固定基准星的相位保持策略更优.

Phase Maintenance Method of Near-Circular LEO Satellite Constellation

The phase maintenance method is introduced for a near circular LEO satellite constellation without orbital altitude maintenance requirements in this paper. According to the orbit perturbation theory, the satellite phase drift model considering J2 perturbation and atmospheric drag perturbation is derived, and then two expression methods of phase deviation based on fixed reference satellite and virtual reference satellite are given respectively. On this basis, the theoretical and practical control quantity considering actual control errors are given for the two cases of orbit decay rate consistent and inconsistent. Finally, the effectiveness of the two methods are verified by a LEO Walker constellation simulation example. The results show that the two methods can effectively complete the phase maintenance task. The two methods have no significant difference in the number of times of control and the total amount of control in the case of orbit decay rate consistent. But in the case of orbit decay rate inconsistent, the phase maintenance strategy based on a fixed reference satellite is better.