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Inertial navigation systems generally consist of timing, acceleration, andorientation measurement units. Although much progress has been made towardsdeveloping primary timing sources such as atomic clocks, acceleration andorientation measurement units often require calibration. Nuclear MagneticResonance (NMR) gyroscopes, which rely on continuous measurement of thesimultaneous Larmor precession of two co-located polarized noble gases, can beconfigured to have scale factors that depend to first order only on fundamentalconstants. The noble gases are polarized by spin-exchange collisions withco-located optically pumped alkali-metal atoms. The alkali-metal atoms are alsoused to detect the phase of precession of the polarized noble gas nuclei. Herewe present a version of an NMR gyroscope designed to suppress systematic errorsfrom the alkali-metal atoms. We demonstrate rotation rate angle random walk(ARW) sensitivity of 16 $\mu \text{Hz}/\sqrt{\text{Hz}}$ and bias instabilityof $\sim$800 nHz.

A Synchronous Spin-Exchange Optically Pumped NMR-Gyroscope