The azimuth error compensation for inclinometer based on gyrocompass

The azimuth error of inclinometer based on gyrocompass changes with different azimuths and incline angles. It has good repeatablility, but it is hard to be described in analytical expression. So a two-dimension look-up table method is proposed to compensate the azimuth error. The testing data in turn-table is used to form the two-dimension data table, which reflects the relationship among the azimuth error, the azimuth and incline angle. And the error characteristic of azimuth error is expressed exactly. Combined with the look-up table method and interpolation method, the azimuth error can be solved exactly and continuously. Turn-table experiments show that this method can increase the measurement accuracy of azimuth greatly, and it has been used for practical orientation in oilfield successfully.