Abstract: Inertial measurement unit test results in initial orientation measurement mode (in azimuth plane) are presented in this paper. Inertial measurement unit configuration and processing algorithm providing selfcorrection of such gyro errors as instability of zero shift, drift and scale factor are presented. Error selfcorrection is based on using continuous one-directional rotation of the inertial measurement unit about one axis which is parallel (for this inertial measurement unit) to its mounted plane. In this case, errors with correlation time much more than inertial measurement unit rotation period have low effect on measurement accuracy and can be easily corrected. This makes inertial measurement unit invariable to a great extent to gyro errors. Influence of the above mentioned gyro errors on azimuth measurement accuracy up to 3 arcmin was not discovered. Potential to increase azimuth measurement accuracy is shown. Though, test results were obtained for the inertial measurement unit employing low accuracy ring laser gyros, the fiber-optic and integrated-optic gyros are more beneficial for such technology. !5
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