The part of the azimuth adopts a revolving pedestal, the part of the pitching combines a photoelectric sensor and the axis of rotation.
方位部分采用转台式结构，俯仰部分把光电传感器与转动轴合二为一。
2
The cost of the gravity passive inertial navigation system will be lower with a rate azimuth platform and gravity sensor constituting a gravity measurement and navigation system.
At present, hole trajectory azimuth Angle is measured mainly with magnetism sensor, but which is restricted by magnetic field and the metal tube around the surveying equipment.