Noninteracting Control of Dynamically Tuned Dry Gyro and Its Application to Measurement of Two-Axis Angular Accelerations

This paper presents a method of reducing the interaction effect between the input and output peculiar to the Dynamically Tuned Dry Gyro (TDG), and the possibility of measuring angular accelerations about two axes, through improvements of the Rebalance Control Circuit (RCC) installed on the TDG. First, the use of the TDG as a two-axis rate sensor is shown along with direct and cross transfer functions relating two outputs and two inputs; and it is shown that the TDG makes it possible to simultaneously measure two-axis angular velocities and two-axis angular accelerations if the RCC is improved to facilitate noninteracting control. Next, the design procedure and the results of the trial manufacture on the hardware of each element of the RCC necessary to meet its capability are shown. Third, from the results of the experiments using this manufactured RCC it is clarified that the frequency characteristics of direct transfer functions which prescribe the system performance are hardly influenced by the manufacturing accuracy of the RCC, but the gain chracteristics of cross transfer functions, which correspond to the degree of reduction of the interaction effect, are significantly influenced by the manufacturing accuracy.