Abstract
Uncertainty in a gyro design means unpredicted problems in design phase, and this will introduce uncompensated errors which must be charged to the gyro. Uncompensated errors in gyros are as follows. (1) Drift instability, (2) Scale factor instability, (3) Temperature coefficient of drift and its instability. As an uncertainty or instability of gyro output is related to not only a design but also manufacturing as causing a change in the location and a randomly substance of adhesive, etc, it is difficult to make clear the level in design phase. However, it is important to find out the principles governing parameters for instability or uncertainty of gyro output. Then, a Day-to-Day stability and a Temperature Coefficient of G-insensitive Drift for TDGs was measured, and furthermore, In-phase spring rate, Quadrature spring rate and offset angle which consist of G-insensitive drift of TDG was measured. As a result of these testings, it was found out that the governing parameter for instability or uncertainty of TDG G-insensitive drift was mainly dependent on offset angle variation. This conclusion will be effective to introduce more accurate TDG in design and fabrication.
