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微小卫星经常用磁强计作为姿态测量的主要部件,磁强计的测量精度是影响微小卫星定姿性能的重要指标。为提高磁场估计精度,采用太阳敏感器和陀螺对磁强计误差进行辅助测量与修正,推导了磁强计误差估计方法,在光照区以太阳敏感器与陀螺输出作为俯仰滤波器观测量,估计出卫星俯仰角度和角速度。再采用最小二乘方法,利用滤波输出量对磁强计误差进行估计,估计的结果进入滤波器对磁场输出进行测量修正。仿真表明该方法简单易行,姿态角精度提高了1°左右,角速度精度最高提高了0.003(°)/s左右,并增强了卫星稳定性,有利于成像等任务的完成,有效提高了微小卫星导航系统性能。
Micro-satellites are often used as a magnetometer as the main component of attitude measurement. The accuracy of the magnetometer is an important index that affects the performance of micro satellites. In order to improve the accuracy of magnetic field estimation, using the sun sensor and gyroscope to measure and correct the error of the magnetometer, the magnetometer error estimation method is deduced. In the light region, with the sun sensor and gyro output as the pitch filter observation, Out of the satellite pitch angle and angular velocity. Then using the least square method, the output of the filter to estimate the magnetometer error, the estimated results into the filter to measure the magnetic field output correction. The simulation results show that the proposed method is simple and easy, the attitude angle accuracy is improved by about 1 °, the angular velocity accuracy is improved by 0.003 (°) / s, and the stability of the satellite is enhanced. This is beneficial to the completion of imaging and other tasks and effectively improves the micro-satellite Navigation system performance.