Precision Evaluation Algorithm And Software Design Of Optical Fiber Strapdown Inertial Navigation System

In recent years,with the development of high-precision military and civilian fields,the accuracy requirements of fiber-optic strapdown inertial navigation systems are getting higher and higher,and the research on system accuracy evaluation technology has become a hot issue in this field.Aiming at this problem,this paper will carry out research work on the accuracy evaluation technology of optical fiber strapdown inertial navigation system.In this paper,a hierarchical method is used to analyze and research the fiber-optic strap-down inertial navigation system,taking the fiber-optic strap-down inertial navigation system as the overall research object,from the inertial devices(gyroscope and accelerometer),inertial measurement unit and the overall inertial navigation system.Three levels are used to evaluate the accuracy of the navigation system.Firstly,the development status of fiber-optic strapdown inertial navigation system,the basic knowledge of inertial navigation system,and the main error source of strapdown inertial navigation system are introduced,and the demand analysis of INS accuracy evaluation software is carried out.Secondly,the algorithm design of the strapdown inertial navigation accuracy evaluation is carried out,and the accuracy evaluation of the inertial navigation system is carried out using the hierarchical method.For inertial devices,the Allan variance method is used to evaluate the accuracy;for the inertial measurement unit,the modular iteration method is used to evaluate the accuracy;for the entire inertial navigation system,the static point navigation method is used to evaluate the accuracy,and the modular iteration method and static point are used to evaluate the accuracy.The navigation method is used for example verification.Finally,the software design of the strapdown inertial navigation accuracy evaluation is carried out.First,the overall design of the software,including software composition design and software logic design,is carried out,and then the inertial device accuracy evaluation module,inertial measurement unit accuracy evaluation module and inertial navigation system accuracy evaluation module.The interface design of the module is carried out,and then the interactive module of the software is designed.After the software design is completed,the function test of the precision evaluation software developed and designed is finally carried out:data processing test,Allan variance evaluation test,and IMU performance evaluation test.