绝对重力仪中3种数据处理方法比较

摘要

绝对重力仪中对激光干涉信号的采集和处理是测量绝对重力加速度的基础。对激光干涉信号进行数字信号处理，其结果可以构建绝对重力仪中自由落体的运动轨迹，讨论3种基于该重建运动轨迹的数据处理方法，分别为整体最小二乘拟合，局部最小二乘拟合以及遗传算法。处理结果表明局部最小二乘拟合方法的处理效果最好，对落体位置的平均拟合误差在4 nm范围内，满足测量精度要求。%It is needed to rebuild the trajectory of free-fall from the laser interferometer signal through digital signal processing in an absolute gravimeter .In this paper, total least square fitting, local least square fitting and genetic algorithm methods are compared based on the rebuilded trajectory .Processing results indicate that the local least square fitting works best , the average displacement residuals are within 4 nm, which meet the accuracy requirements .