带有控制增益自校正的甚低轨道卫星自主轨道维持方法

Autonomous Orbit Maintenance Strategy Using Control GainCorrection for Very Low Orbit Satellite

为实现甚低轨道的长期稳定运行,分析了甚低轨道的摄动特性,设计了一种带有轨控增益校正的自主轨道维持方法。该方法可通过前一次轨控的结果对轨控增益进行校正,提高轨控算法对卫星质量、推力大小等不确定因素的鲁棒性,逐渐提高轨道控制的精度。对轨道控制的频率、每次轨控的时间长度及对偏心率的影响进行了分析,仿真结果表明:自主轨道维持方法能实现甚低轨道高度维持控制,在参数不确定的情况下,与传统算法相比可大幅提高轨道控制的精度,确保平均偏心率矢量收敛,满足甚低轨道卫星的长寿命要求。所设计的算法结构简单,运算量小,可由目前的星载计算机实现。

To realize the long-term stable operation of the satellite in the very low orbit, the perturbation characteristics of the very low orbit are analyzed. An autonomous orbit maintenance method using control gain correction is proposed to improve the robustness of the orbit control algorithm. The orbit control gain can be estimated and corrected based on the result of the last orbit control, which can further reduce the control error under the influence of some parameter uncertainties, such as the mass and the thrust. The period between each orbit control as well as the duration of each control procedure are analyzed. Simulation results show that the proposed method can achieve very low orbit maintenance and guarantee the convergence of the average eccentricity. In comparison with the traditional orbit control algorithm, the proposed method is robust to parameter uncertainties, satisfying the requirement of the very low orbit satellite on the long flight duration. This control gain correction algorithm is simple and available to the current satellite-borne computer.