立方星陀螺/双星敏感器组合定姿方法

针对单星敏感器绕视轴方向旋转角测量精度相对较差的问题,提出了一种利用微机电系统陀螺和同时工作的双星敏感器的测量来获得精确的立方星姿态信息的方法。该方法基于平均双四元数的思想,基于乘性扩展卡尔曼滤波算法制定了集中式和分散式两种姿态确定方案。仿真分析结果表明,所提出的陀螺/双星敏感器姿态确定方法,在采用低成本、低精度的姿态敏感器以及传统滤波算法的情况下,仍能有效提高立方星的定姿性能,具有较高的精度和较快的收敛性。为立方星低成本、高精度姿态确定提供了一种可行的参考,并且具备一定的工程应用价值。

Gyro/double star sensors integrated attitude determination for CubeSat

For the problem that the measurement precision of the rotation angle about line-of-sight vector of single star sensor is relatively low, a method of utilizing measurement from MEMS(micro-electro-mechanical system) gyro and two simultaneously operating star sensors to obtain accurate attitude knowledge of CubeSat was proposed. Based on the idea of averaging two quaternions, two attitude determination schemes called centralized filter and decentralized filter were drawn up by using MEKF(multiplicative extended Kalman filter). Simulation results indicate that attitude determination performance is improved effectively by the presented method and it has higher precision and quicker convergence, under the circumstance of utilizing low-cost and low-accuracy attitude sensors and traditional attitude filtering algorithm. It provides a feasible reference for low-cost and high-precision attitude determination of CubeSat, and has certain engineering application value.