一种适用于金星气动捕获的预测制导算法

Prediction guidance algorithm for Venus aerocapture

针对金星探测制动捕获过程速度增量需求大、燃料携带量多的问题,结合金星稠密大气环境特点,分析了利用气动阻力捕获降轨的可行性,提出了一种基于解析预测修正制导算法的气动捕获方案,可在短时间内进入目标圆轨道,达到节省燃料、实现快速轨道调整的目的。根据飞行任务特点,将纵向和侧向运动解耦,纵向运动控制基于预测制导算法,侧向运动由倾侧角翻转控制实现。仿真结果表明,所采用的制导方法能够有效克服初始误差和参数不确定性的影响,具有较强的鲁棒性。

The aerocapture process during Venus exploration requires large amount of velocity increments (ΔV) and consume much more fuel. To solve this problem, an aerocapture scheme based on analytical predictor-corrector guidance algorithm is proposed which uses the probe's aerodynamic drag to capture the Venus and enter into target circular. In order to reduce the complexity of the algorithm, it is assumed that the longitudinal and lateral movements are decoupled, and the bank angle reversal strategy is used for the lateral control. Finally, mathematics simulations are made which show that the proposed guidance algorithm is robust and can overcome the influence of the initial errors and parameter uncertainty. ©, 2015, Editorial Department of Journal of Chinese Inertial Technology. All right reserved.