Toward a Navigation-Grade Miniaturized Gyroscope
Boeing Corporation Tukwila United States
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Navigating guided munitions requires operating in theatres with a high probability of GPS denial. In such environment an Inertial Navigation System INS capable of autonomous navigation for several minutes without relying on GPS is highly desirable. One main ingredient of such a system is an accurate gyroscope. For years, Boeing has been perfecting the design of a Disc Resonator Gyroscope DRG based on Micro-Electromechanical Systems MEMS that shows the promise of meeting the requirements needed for this task. This paper describes Boeings DRG technology targeting a Bias Instability 0.01 deg square root of hr and Angle Random Walk ARW 0.001 deg square root of hr. A Digital Signal Processing DSP-based INS, built using this Gyroscope, targeting a final azimuth accuracy of or -1 mil in less than 60 seconds is also discussed. The paper focuses on the impact of packaging on gyroscope performance, in particular the sensitivity of DRG stability to strains caused by stresses during packaging and assembly.