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首页> 外文期刊>Transactions of the Institute of Measurement and Control >A composite guidance law with enhanced anti-disturbance capability for Mars pinpoint landing
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A composite guidance law with enhanced anti-disturbance capability for Mars pinpoint landing

机译：具有增强的抗干扰能力的火星精确着陆的复合制导律

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摘要

The landing safety and accuracy of a Mars lander will be seriously degraded due to multiple unknown disturbances or perturbations in the powered descent phase. A novel composite guidance algorithm is proposed to improve the landing performance in this paper. The presented guidance algorithm, with a composite hierarchical framework, is developed by the combination of disturbance observer-based control and multiple sliding surfaces guidance theory. The major disturbance owing to the Mars wind could be estimated through a disturbance observer and incorporated in the feed-forward compensation in the inner loop, other disturbances or perturbations could be attenuated by the multiple sliding surfaces technique in the outer loop. The composite guidance algorithm could be utilized without a pre-computed reference trajectory and it has enhanced anti-disturbance capability compared with the multiple sliding surfaces guidance law. Its global stability is verified using a Lyapunov-based approach. Monte Carlo simulation results show that the composite guidance law has a better performance on guiding a Mars lander from the point of engine ignition to the desired landing point in the presence of disturbances and perturbations.
机译：火星着陆器的着陆安全性和准确性将由于动力下降阶段中的多个未知干扰或扰动而严重降低。提出了一种新颖的复合制导算法，以提高着陆性能。结合基于扰动观测器的控制和多滑动面制导理论，提出了具有复合层次框架的制导算法。可以通过扰动观测器估算由火星风引起的主要扰动，并将其纳入内环的前馈补偿中，而其他扰动或扰动可通过外环中的多滑动面技术进行衰减。该复合制导算法可以在没有预先计算的参考轨迹的情况下使用，并且与多滑动面制导律相比具有增强的抗干扰能力。使用基于Lyapunov的方法验证了其全局稳定性。蒙特卡罗模拟结果表明，在存在扰动和扰动的情况下，复合制导律在将火星着陆器从发动机着火点引导至所需着陆点方面具有更好的性能。

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