点火脉冲对GRACE加速度计校准的影响

摘要

The SuperSTAR accelerometers on GRACE satellites,which directly and precisely measure the non-gravitational forces,need to be calibrated by evaluating the scale and bias parameters.In this paper,the characteristics of pulse thrusting signal included in the accelerator observations are analyzed and their effect on accelerator calibration is discussed.Research based on the situ data of acceleration in April 2008 demonstrates that maximum effect of pulse thrusting on the calibrated scale parameter reaches 0.02,the calibrated bias parameter comes to 10-7 m· s-2,the calibrated acceleration amounts to 10-9 m·s-2,10 10 m·s-2 on the Y and Z axis respectively.%GRACE卫星搭载的高精度SuperSTAR加速度计观测数据包含点火脉冲信号,本文分析点火脉冲数据特点,讨论点火脉冲对加速度计校准结果(尺度参数和偏差参数)的影响.2008-04一个月的加速度计实测数据分析表明,点火脉冲对尺度参数、比例参数的影响最大分别为0.02、10-7m·s-2,对加速度校准结果的影响在Y、Z方向上高达10-10m·s-2.