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本文提出了一般相对轨道动力学方程和用于编队飞行的GPS星载自主导航模型和算法。同时文章也提出了用GPS伪距测量信息实现卫星编队飞行的建立和保持的自主导航控制方法。其中包括用于编队飞行建立的非线性控制律和用于编队飞行保持的线性控制律,以及相应的估计器的算法。作为这些方法的一个实际应用,文章给出了EO-1/Landsat 7编队飞行的自主导航控制系统的设计和实现。一般情况下最优控制律的实现是需要变推力发动机的,在没有变推力发动机的情况下,本文特别给出并验证了用冲量等价的方法实现变推力发动机替代的可行性。上述设计已经过数字仿真的验证,证实了设计的正确性和实现的可行性。
In this paper, general relative orbit dynamics equations and GPS onboard autonomous navigation models and algorithms for formation flying are proposed. At the same time, the article also proposed using GPS pseudo-range measurement information to establish and maintain satellite formation flying autonomous navigation control method. These include the nonlinear control law used in formation flying and the linear control law used in formation flight keeping, as well as the algorithm of the corresponding estimator. As a practical application of these methods, the article presents the design and implementation of autonomous navigation control system for EO-1 / Landsat 7 formation flight. Under normal circumstances, the realization of the optimal control law requires the variable thrust engine. In the absence of a variable thrust engine, this paper especially gives and verifies the feasibility of using variable momentum equivalent method to achieve variable thrust engine replacement. The above design has been verified by digital simulation to confirm the correctness of the design and the feasibility of its implementation.