Signal Processing in Cold Atom Interferometery-Based INS

摘要

Highly accurate cold atom interferometers (CAI) for the measure-rnment of acceleration and angular rate are in developement to supplementrnor replace current navigation quality, conventional inertial measurementrnunits. A major drawback of the atomic interferometers is their low dutyrncycle, caused by delays required for cooling the atoms and collectingrnacceleration and angular rate measurements. A method is herein pro-rnposed for inertial navigation by interweaving low duty cycle but accu-rnrate cold atom interometry-based measurements with high bandwidth,rnconventional inertial navigation system measurements. Error analysisrnshows a 47.7 percent reduction in navigation errors of the enhancedrninertial navigation system compared to a conventional free-inertial nav-rnigation system. The navigation error reductions remain constant whenrnthe conventional inertial navigation system errors are increased fromrn1000 [m/hr] to 1500 [m/hr] with the same external conditions.