冷原子重力仪及重力梯度仪中的姿态扰动研究

Rotation Fluctuation Noise Evaluation and Compensation in Cold-Atom Gravimeter and Gradiometer

冷原子绝对重力仪和冷原子重力梯度仪在外界动平台上的精度相较实验室精度差距较大,其中最主要的振动噪声目前已经有较为成熟的方案进行抑制,而由于载体转动引起的姿态噪声目前尚未研究。从冷原子干涉仪的敏感机制入手,推导了在姿态扰动情况下冷原子绝对重力仪和重力梯度仪的相位改变,并利用双光子拉曼演化方程给出了相应的高阶灵敏度函数补偿方案,提升了冷原子绝对重力仪和重力梯度仪在复杂环境下的灵敏度和环境适应性。

There are significant differences of the performances of the cold-atom absolute gravimeter and gradiometer between in-lab and outdoors experiment.The vibration noise which plays a major role in the noisy environment can be suppress dramatically by the sensitivity function.However,the remaining rotation noise has not yet been studied.Here,we derive the phase change respond related to the rotation fluctuation via the physical mechanism of the inertial sensing.High order sensitivity function compensation algorithm is provided by calculating the two-photon Raman transition evolution,which significantly increases the sensitivity and environmental suitability of both the cold-atom absolute gravimeter and gradiometer.