^4fThe Application of Fiber Optic Gyroscope in Dynamic Orientation System

摘要

^7fThe orientating problem existed in project measuring, such as mining, geological survey, forest exploration, tunnel penetration, etc. With the improvement of industrial mechanization and automation, higher efficiency and precision were required in engineering measurement. This paper presented a dynamic north-finding scheme based on the modulation output of fiber optic gyroscope, which was the north component of the earth rotation angular. In this scheme, the sine output signal of the FOG was sampled and disposed, and then the real north of surveyed point on the surface of earth was calculated with the least square estimation method. Thus the random coordinate azimuth was determined. Furthermore, the deviation caused by base tilt and axle mounting was compensated by the accelerometer, by which the precision of north-finding was greatly improved. The north-finding system could be applied in various fields because of its simple structure, short operation time, high precision, stable performance, direct digital signal output (which was easy to be connected with computer) and low cost. Moreover, it also laid foundation for the application and development of engineering measurement.