惯性技术视角下动态重力测量技术评述(四):无陀螺惯性导航与重力梯度测量的融合

Overview on Dynamic Gravimetry in the Perspective of Inertial Technology,Part Ⅳ : The Fusion of Gyro-free Inertial Navigation and Gravity Gradiometry

加速度差分式重力梯度仪与无陀螺惯性导航系统都采用一组在三维空间中布置的加速度计,二者在硬件配置和工作原理层面都具有紧密联系。从比力测量的空间差分公式出发,详细推导了重力梯度测量和无陀螺惯性导航系统共同的工作原理,指出当前对后者的研究中存在的忽略重力梯度的问题,并论述了二者的融合应用。

Both acceleration-difference gravity gradiometers and gyro-free inertial navigation systems use a set of accelerometers located at different positions in the 3D space.So there are close connections between them in hardware configurations and theoretical principles.The common theory of both systems are analyzed in detail through deriving the equations of space difference of the specific force of the accelerometers.A pitfall that the gravity gradient is ignored in the current study of the gyro-free inertial navigation system is pointed out.The potential fusion of the two systems is forecasted.