Fully Compensated Method for Earth Rotation Measurement with Micromechanical Yaw-rate Gyro

The direct measurement of the Earth´s rotation rate with a micromechanical yaw rate gyroscope is highly embarrassed by insufficiently high parameters of most of the contemporary sensors from this type. A method with a full compensation of external factors of influence - bias drift, linear acceleration sensitivity is proposed. A model of the sensor´s measurement is developed and used for final calculation of Earth´s rate. This allows a determination of a quantity such as the Earth´s rotation rate, which is at the border of the sensor´s sensitivity and less that its short-term stability. A number of measurements are performed and an averaged value for the Earth´s rotation rate is derived. This method is applicable for a determination of the threshold sensitivity of a micromechanical gyro without the need of an additional source of a very low angular speed and without any special methods for bias drift compensation and linear acceleration sensitivity.