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Shen J.,Beijing Institute of Technology | Miao L.,Beijing Institute of Technology | Wu J.,Beijing Institute of Technology | Wu J.,Beijing Automatic Control Equipment Institute | Guo Z.,Beijing Institute of Technology
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2013

Fiber optic gyroscope (FOG) is sensitive to temperature, and there is a certain temperature drift error in the working process of FOG especially in the startup phase. In this paper, to reduce the bias drift in the startup phase of FOG and shorten the startup time, a scheme based on radial basis function (RBF) neural networks was designed to compensate the drift in the startup phase of FOG. The model took the temperature of FOG and the temperature change rate as the inputs and used the bias drift of FOG as the output. In the room temperature, the RBF neural network was used to compensate the startup drift of FOG, and the experiment shows that the method can effectively reduce the temperature drift and shorten the startup time of FOG. This method is used in a certain type of FOG north finder and can greatly reduce the preparation time, and so improves the north-seeking accuracy. Source


Wu J.-W.,Beijing Institute of Technology | Wu J.-W.,Beijing Automatic Control Equipment Institute | Miao L.-J.,Beijing Institute of Technology | Wu Y.-J.,Beijing Automatic Control Equipment Institute
Advanced Materials Research | Year: 2011

The key design and implementation methods of Miniature 3-axial Fiber Optic Rate Sensor are described in detail. Based on plenty of theoretical analysis and experimental validation, effective measures and key technology on optical components, fiber coil technics, assembly methods, control circuits and structure solidity are adopt and summarized. Finally, its main engineering performance is tested and listed detailedly. From experimental results and engineering practice, we can conclude that Miniature 3-axial Fiber Optic Rate Sensor has the performance of high reliability, radiation resistance, low air pressure resistance, temperature resistance and high reliability, and can be widely used in some special and professional fields. More importantly, it greatly promotes the development of fiber optic sensing and inertial technology application of China. Source


Wu J.-W.,Beijing Institute of Technology | Wu J.-W.,Beijing Automatic Control Equipment Institute | Miao L.-J.,Beijing Institute of Technology | Xu G.,Beijing Automatic Control Equipment Institute | And 2 more authors.
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2010

Miniature tri-axis FOG is a new generation miniature-optical angle rate sensor based on Sagnac effect. It can sense the angle rate of three orthogonal directions simultaneously on space and has advantages of small volume, light weight and little power consumption. The principle and development of miniature tri-axis FOG at home and abroad were introduced; the adverse influence of fiber's small curve radius on miniature tri-axis FOG was analyzed. And a new methods for restraining this adverse influence were put forward to meet the requirement of engineering. Theoretical precision limit of miniature tri-axis FOG was obtained. Miniature tri-axis FOG was designed by optimizing optical system and tested according to GJB2426A-2004. These lay a good foundation for miniature tri-axis FOG's application in practice. Measurement results show that the main technical parameters of miniature tri-axis FOG can reach and even exceed the level of similar products abroad. More importantly, it greatly promotes application and development of miniature tri-axis FOG in China. Source

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