冷原子干涉动态重力测量中的噪声与系统效应分析  

Analysis of noise and system effect in cold atom interference dynamic gravity measurement

作　　者：车浩 李安[1] 覃方君[1] 黄春福 CHE Hao;LI An;QIN Fangjun;HUANG Chunfu(School of Electrical Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学电气工程学院,湖北武汉430033

出　　处：《量子电子学报》2023年第5期700-711,共12页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金面上项目(61873275)。

摘　　要：采用灵敏度函数分析法对冷原子重力仪的噪声进行了分析,并基于各噪声对应的传递函数建立噪声传递模型,定量分析评估了振动噪声、拉曼光相位噪声和磁场噪声对重力测量灵敏度的影响。基于科里奥利力和稳定平台倾斜角等系统效应的修正公式,建立系统效应分析模型,定量分析评估了航向角偏差、速度偏差和纬度偏差对科里奥利力修正量的影响,以及倾斜角偏差对稳定平台倾角修正量的影响。仿真和部分实测数据表明,一方面,各噪声被限制到特定水平时,其对原子干涉灵敏度的影响仍可达μGal级;另一方面,1°的航向角偏差或0.1 m/s的速度偏差对科里奥利力修正量的影响可达1 mGal以上,1′的倾斜角偏差对稳定平台修正量的影响也可达0.42 mGal,说明噪声和系统效应的影响都是不容忽视的。因此,在动态条件下,冷原子重力仪必须进行噪声抑制和系统效应修正,才能获得预期的高灵敏度、高精度重力测量结果。The noise of the cold atom gravimeter is analyzed using the sensitivity function analysis method,and then based on the corresponding noise transfer function,a noise transfer model is established and the contribution of vibration noise,Raman optical phase noise and magnetic field noise to the sensitivity of gravity measurement is quantitatively analyzed and evaluated.In addition,based on the correction formulas of Coriolis force and stable platform tilt angle,a system effect analysis model is established,and the influence of heading angle deviation,speed deviation and latitude deviation on the correction of Coriolis force is quantitatively analyzed and evaluated,as well as the influence of the tilt angle deviation on the correction of stable platform tilt angle.Simulation and some measured data show that,on the one hand,when each noise is restricted to a specific level,the influence on the sensitivity of atomic interference can still reachμGal level.On the other hand,1°heading angle deviation or 0.1 m/s speed deviation can affect the correction of Coriolis force to more than 1 mGal,and 1'tilt angle deviation can also affect the correction of stable platform up to 0.42 mGal,indicating that both effects of noise and system effects cannot be ignored.Therefore,under dynamic conditions,the cold atom gravimeter should undergo noise suppression and system effect correction to obtain high-sensitivity and high-precision gravity measurement results.

关 键 词：量子光学 重力测量 冷原子干涉重力仪 噪声分析 系统效应 

分 类 号：P223[天文地球—大地测量学与测量工程]