The Research on Errors-Modulated and Modeling Technique in RFSINS

• 1、Navigation Research Center in the College of Automation Engineering,Nanjing University of Aeronautics and Astronautics.

Abstract：FSINS (Fiber Strapdown Inertial Navigation System) based on fiber optic gyros, is used more and more widely nowadays. The navigation precsion of FSINS is mainly determained by the performance of its inertial measurment unit (IMU, including three fiber optic gyros and three accelerometers).Different from the traditional FSINS, this paper proposed a new conformation named RFSINS( Rotary FSINS ) to improve the navigation precsion of SINS, by adding a rotating disk, on which two mid-precision FOGs were placed orthogonally, while the third high-precision FOG ,which is sensing orientation angular rate, isn't fixed on the disk. The purpose of the proposed scheme of RFSINS is to increase the presiton of inertial navagation system clearly as well as lower it's cost, in the way of modulating and depressing the errors of IMU through the rotating disk. The error-modulated theory of RFSINS was analysed, and the structure of RFSINS was proposed. And also, a method of compensating the FOG's output errors which caused by the temperature in RFSINS was propsed in this paper. At last, the result of simulation and experimentation indicated that the propsed scheme can improve the positioning precision of strapdown inertial navigation system apparently. Besides, in line with the development of FSINS, the proposed scheme with the characters of low-cost and high-precision,will have great value in its engeering application.

keywords： Fiber Strapdown Inertial Navigation System Rotary FSINS modulation of errors

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