At present, the following three methods are often used for precise orientation of gyrotheodolite
(1) tracking reversal point method (2) transit method (3) gyro stationary position method
Here we introduce the tracking reversal point method commonly used in our country.When the gyro theodolite USES the tracking reversal point method to conduct orientation at a measuring point, its operation procedure is roughly as follows:
(1) strictly set the theodolite and the gyro on the rack, and measure the direction of the measuring line with one measuring back, and then roughly set the instrument to the north;
(2) to lower the sensitive part to make zero-position observation before measurement;
(3) rough orientation, which can be completed by the attachment rough orientation compass, but also can be completed by the two-point reversal point method, quarter-cycle method and swing amplitude method.
(4) when the theodolite rotates to the position of coarse orientation, start the gyro, slowly lower down the sensitive part of the gyro after reaching the rated speed, limit the amplitude, and track with the micro-motion spiral.Tracking should be smooth and continuous.Do not track in time, sometimes behind the sensitive part of the swing, sometimes quickly catch up or more than a lot.Because these conditions affect the accuracy of the results.When the swing reaches the reversal point, five consecutive reversal point readings U1U2U3U4U5 are read
(5) lock the gyro and brake, and make zero-position observation after measurement;
(6) the direction value of the measuring line is determined by one measuring loop. When the mutual difference between the two measuring loops conforms to the limit difference, the average value is taken as the direction value of the measuring loop.Directional edge coordinate direction Angle calculation steps are as follows: gyroscope azimuth = line direction value – gyro north direction geographical azimuth = gyroscope azimuth + apparatus constant coordinate azimuth = geographical azimuth – meridian convergence Angle instrument constants can be known in azimuth wires or triangle point measurement, press type calculation available at the time of the measuring instrument constants geographical azimuth,
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