SINS	Strapdown Inertial Navigation System
GPS	Global Positioning System
RMS	Root-mean-square
RMSE	Root-mean-square error
2D-LDV	2D Laser Doppler Velocimeter
UWB	Ultra-Wide Band
VIO	Visual–Inertial Odometry
ARMSE	Average root-mean-square error
PIT-AKF	An adaptive Kalman filtering algorithm for measurement interruption
	based on polynomial interpolation and Taylor expansion
SKF	Standard Kalman filter algorithm
UMI-KF	Kalman filtering algorithm without any measures in the face of a
	measurement interruption
IMU	Inertial measurement unit
COTS	Commercial off-the-shelf
RMSE-DA	Root-mean-square error of attitude angle estimation
RMSE-dV	Root-mean-square error of velocity estimation
RMSE-dP	Root-mean-square error of position estimation