The direct measurement of the Earth's rotation rate by means of a micromechanical yaw-rate gyroscope is difficult to achieve due to the considerable parameter variations of the current state-of-the-art sensors of this type. This paper outlines and applies a model of the external factors' effect on the sensor measurement via a method for their compensation through a mechanical change in the sensor's orientation. This allows the determination of a value such as the Earth's rotation rate, which is at the limit of the sensor's sensitivity and less than its short-term stability. A specialized information-measurement system has been developed for the implementation of the method. This system has been used for a number of measurements, presented in a graphical form. As a result, an average value of the Earth's rotation rate has been derived. This method is applicable for a subjective categorization and evaluation of micromechanical gyroscopes using a natural source of a very low angular speed.

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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 ofexternalfactors 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.