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Fault detection and isolation of satellite gyroscopes using relative positions in formation flying

机译：利用编队飞行中的相对位置进行卫星陀螺仪故障检测与隔离

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摘要

A fault detection and isolation method for satellite rate gyros is proposed based on using the satellite-to-satellite measurements such as relative position beside orbit parameters of the primary satellite. By finding a constant of motion, it is shown that the dynamic states in a relative motion are restricted in such a way that the angular velocity vector of primary satellite lies on a quadratic surface. This constant of motion is then used to detect the gyroscope faults and estimate the corresponding scale factor or bias values of the rate gyros of the primary satellite. The proposed algorithm works even in time variant fault situations as well, and does not impose any additional subsystems to formation flying satellites. Monte-Carlo simulations are used to ensure that the algorithm retains its performance in the presence of uncertainties. In presence of only measurement noise, the isolation process performs well by selecting a proper threshold. However, the isolation performance degrades as the scale factor approaches unity or bias approaches zero. Finally, the effect of orbital perturbations on isolation process is investigated by including the effect of zonal harmonics as well as drag and without loss of generality, it is shown that the perturbation effects are negligible. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：提出了一种基于卫星到卫星的测量方法，例如主卫星轨道参数旁边的相对位置，提出了一种卫星速率陀螺仪的​​故障检测和隔离方法。通过找到运动常数，表明相对运动中的动态状态受到限制，使得主卫星的角速度矢量位于二次曲面上。然后，使用该运动常数来检测陀螺仪故障并估算主卫星的速率陀螺仪的​​相应比例因子或偏差值。所提出的算法甚至在时变故障情况下也有效，并且不对编队飞行卫星施加任何额外的子系统。蒙特卡洛模拟用于确保算法在存在不确定性的情况下保持其性能。在仅存在测量噪声的情况下，隔离过程通过选择适当的阈值可以很好地执行。但是，随着比例因子趋于统一或偏置趋于零，隔离性能会下降。最后，通过包含区域谐波和阻力的影响，研究了轨道扰动对隔离过程的影响，并且没有失去一般性，这表明扰动效应可以忽略不计。 （C）2018 Elsevier Masson SAS。版权所有。

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