基于改进伪谱反馈控制的远程变轨闭环制导

利用最优反馈控制和轨迹快速重构技术，设计一种有限推力空间远程变轨自适应闭环制导方法。首先给出了最优反馈控制的求解原理和必要条件。将空间变轨动力学模型特点和伪谱法相结合，设计基于状态量缩减的计算效率改进策略以提高轨迹优化的实时性。基于改进伪谱法进行逐次轨迹快速重构，利用开环最优解形成闭环反馈，从而保证制导指令的实时更新，并通过引入控制逻辑改进制导算法。远程交会仿真表明，该闭环制导方法在保证任务指标具有一定最优性的同时，可以有效抑制多种参数不确定性和外界干扰的影响，具有较高的制导精度、自适应性和鲁棒性。

Modified Pseudospectral Feedback Control Based Closed Loop Guidance for Long Range Orbit Maneuver

An adaptive closed-loop guidance algorithm based on optimal feedback and rapid trajectory reconfiguration is studied and proposed for long-range orbit maneuver with finite thrust. Firstly principles and necessary conditions are presented to solve the optimal feedback control problem. Combining the characteristics of the dynamics model with the pseudospectral method, a computational efficiency refinement method with the reduced state parameters is proposed to improve the efficiency of trajectory optimization. The modified pseudospectral method is used for the successive rapid trajectory reconfiguration such that the open-loop optimal solution is fed back to the system to update the guidance commands in real-time. A control logic algorithm is introduced to improve the performance of the guidance algorithm. Considering many kinds of parameter uncertainties and external disturbances, lots of simulations of long-range space rendezvous are carried out successfully. The Simulation results indicate that the algorithm can not only provide an excellent optimal solution with high accuracy for practical mission, but can suppress uncertainties and external disturbances autonomously, adaptively and robustly.