The use of vibratory gyros to supplement non-inertial navigation systems is limited almost entirely by noise and drift properties of those gyros. This paper examines the nature of these performance characteristics to show how size, material and configuration can be specified to select or make the optimum gyro for the application. The gyros tested are the quartz tuning fork, piezoceramic tuning fork, silicone ring, piezoceramic cup, and piezoceramic bar types. The comparison of the spectral analysis data and the size, material and configuration attributes of the associated gyro were used to construct an empirical formula that predicts solid-state gyro bias noise to a high degree of accuracy.
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