卫星平台扰动对星载原子干涉重力梯度仪测量影响分析

Analysis of influence of satellite platform disturbance on spaceborne atom-interferometry gravity gradiometer measurement

面向未来空间应用,分析了卫星平台扰动对星载原子干涉重力梯度仪测量噪声的影响。其中卫星平台平动自由度的干扰加速度导致梯度仪质心偏差和梯度仪基线长度变化,卫星平台转动自由度的干扰加速度带来拉曼激光方向偏离,引入额外的离心力与科里奥利力。分析结果表明,对于卫星平动自由度,其干扰加速度贡献的原子干涉重力梯度仪测量噪声较小,可忽略不计;对于卫星转动自由度,可通过对卫星角运动的测量和补偿,将原子干涉重力梯度仪的测量噪声在0.1 Hz以下的测量频带内抑制到1 mE/Hz^(1/2)。所述研究将对未来原子干涉重力梯度仪的星载应用提供理论支撑。

For future space applications,the influence of satellite platform disturbance on the measurement noise of the spaceborne atom interferometry gradiometer is analyzed.The disturbance accelerations of translational degrees of freedom will cause a deviation of the gradiometer’s center of mass and the length change of the gradiometer baseline,while the disturbance accelerations of the rotational degrees of freedom will bring a deviation of the Raman laser direction,and introduce additional centrifugal and Coriolis force.The results show that for the satellite translational degrees of freedom,the measurement noise contribution for the atom interferometry gravity gradiometer is small and can be ignored;For the satellite rotational degrees of freedom,by measuring and compensating the satellite angular motion,the noise contribution for the atom interferometry gradiometer can be suppressed to about 1 mE/Hz^(1/2)in the measurement bandwidth below 0.1 Hz.The research will provide theoretical support for the future space application of the atom interferometry gradiometer.