The increase of analytic gyrocompass system precision constructed on dynamically turned gyro

摘要

The analytic gyrocompass system (AGS) consists of three or two single-axes accelerometers, two components rate gyro based on dynamically turned gyro (DTG) and computer. This type of AGS is the base of gyro inclinometer that was made on the chair of the precision instrument making of the Tomsk Polytechnic University. Inclinometer exploitation showed reducing of the precision of determination of orientation parameters during the time. The main reasons of it are mechanical actions on hole probe. The blows create the appearance of residual deformation of DTG joint flexure assembly. Authors ascertained the dependence of rate gyro error from device orientation relatively to gravity vector. The error model of rate gyro was received. Eight constants, that are members of the expression for calculation of corrected angular rates values are defining during conducting of the recurrent metrological calibration test. It is necessary to know the values of angular rate measured by device in its eight different attitude relatively geographic oriented coordinate system. For realization of offered method it is necessary to have two axes test stand. The expressions for calculation of corrected angular rates, the formulas for determination constants of this expressions and the requirements of the stand are given. Experimental test of this method have shown that error of definition orientation in azimuth AGS, based on DTG like GVK-6, that have been used earlier in hole device inclinometer composition have reduced more then to one order (from 3-4 degree till 0.1-0.2).