The gyro theodolite is a theodolite with a gyro device used to determine the true north azimuth of the survey line.The gyro theodolite is simple and rapid in measuring true azimuth, and it is not limited by time. It is often used in the measurement of roads, railways, tunnels and mines.
Gyroscopic theodolite, is a gyroscope and theodolite through the connecting mechanism for the determination of true north azimuth of the instrument.It USES the physical character of the gyroscope (fixed axis and precession), the metal belt hanging downward move of gyro sensitive to sensitive level of earth rotation angular velocity component, under the influence of gravity, produce a northward into the dynamic torque, make gyroscope spindle meridian plane reciprocating swing around the earth, so as to determine true north azimuth.Gyro theodolite is widely used in mine surveying, engineering surveying and military surveying, and is also an important supporting equipment for radar antenna orientation, UAV flight orientation, artillery and long-range weapon launch orientation.
The gyro theodolite consists of a gyroscope, a theodolite and a tripod.
Gyroscope is the core of the system, which is mainly composed of gyro sensitive part, electromagnetic shielding mechanism, hanging wire and guide wire, azimuth rotary servo drive device, damping device, inertial sensitive part locking device, supporting and leveling device, photoelectric Angle sensor, power supply, control and display part, etc.
The gyro sensitive department is provided with a gyro motor rotating at a constant speed. The gyro motor is suspended on the gyro frame by the hanging wire and powered by the guide wire.
The gyro sensitive part locking device is to ensure the safety of the gyro sensitive part in the transportation state, and to fixate the inertial sensitive part with the frame.
The damping device attenuates the swing amplitude of the gyro sensitive part after release, so that its swing state can meet the requirement of seeking north, and finally overcome the northward precression moment, so that the gyro sensitive part is relatively stable in a fixed position in the inertial space.Damping has friction damping, liquid damping and electromagnetic damping.
The azimuthal indentations servo drive system can realize the azimuthal rotation of the gyroscope and provide the rotation torque and stable transmission.
The support and leveling device can realize the mechanical and optical docking between the theodolite and the gyroscope, the leveling of the whole instrument and the installation and fixation of each component.
The photoelectric Angle sensor includes a photoelectric Angle sensor for detecting the swing Angle of the inertial sensing part and a grating code disk system for detecting the azimuth rotation Angle of the gyroscope.
Electromagnetic shielding is mainly used to shield the interference of internal and external magnetic fields to gyro north finding.
The control and display part collects the signal through the sensor, and processes it, and completes the lock and release of the gyroscope sensitive part, damping control, azimuth follow-up, communication, calculation, sending and display true north azimuth and other functions.
(2) the theodolite
The theodolite is the bearing extraction device of the system. It can also measure the target geographical azimuth or coordinate azimuth by aiming at the measured target.The theodolite has self-collimation function, which is convenient for measurement and calibration.Usually, the theodolite has a serial communication interface, which can realize serial data communication with the gyroscope and command system.
(3) the tripod
The tripod provides support for the gyro theodolite.
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