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复杂行星表面着陆避障增广曲率制导方法

Hazard Avoidance for Complex Planetary Surface Landing Using Augmented Curvature Guidance Method

  • 摘要: 针对复杂行星表面安全着陆问题,提出避障增广曲率制导方法。在基本曲率制导律的基础上引入障碍规避增广项。该方法利用着陆器着陆空间区域划分的思想,在障碍附近易发生碰撞区域建立膨胀预警区,基于膨胀预警区推导连续解析的障碍规避制导律,在满足几何凸轨迹状态约束的同时,考虑着陆器与障碍的相对位置关系,能够快速引导着陆器远离障碍,提高着陆器着陆过程中的安全性。仿真结果表明,该方法能够有效规避复杂行星表面的地形障碍,实现在行星表面定点软着陆,具有良好的灵活性和可靠性。

     

    Abstract: A hazard avoidance strategy based on augmented curvature guidance was presented for complex planetary surface landing. Based on the basic curvature guidance law, a hazard avoidance augmentation term was introduced. The idea of spacecraft landing space division was used and an anti-collision zone was defined in the collision prone zone near the hazards. The continuous analytical hazard avoidance guidance law was derived based on anti-collision zone. While meeting the geometric convex trajectory state constraints, the hazard avoidance guidance law evaluated the relative position relationship between spacecraft and hazards, which can quickly steer the spacecraft away from hazards and increase landing safety. Simulation results reveal that the validity of avoiding terrain hazards on the complex planet surface and achieving pinpoint soft landing is enhanced, with good flexibility and reliability.

     

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