Study On A Algorithms In Gyroscope Free Strap-down Inertial Navigation System(GFSINS)

The research of GFSINS has the important significance owing to its outstanding virtues such as low cost ,low power,longevity ,high reliability and promote reaction. GFSINS is a kind of advanced inertial navigation technology.Nowadays,the accuracy level of GFSINS in our country is still low and leads to the accelerated growth of navigation errors that the angular speed of carriers is got by accelerometers instead of gyroscopes.Thus,it is necessary to study the high precision algorithms for GFSINS.In the paper, the following works have been done: a new twelve-accelerometer model is set up based on analyzing typical six-accelerometer and nine-accelerometer model ,which adapt well to cases of projectile attitude measurement in the environment of high rate of revolution. not only the twelve-accelerometer model can be installed in limited space, but also of carriers can be expressed only by the output of accelerometers and the angular speed errors don't grow . second, after comparing and analyzing existing attitude algorithms, a conclusion is drawn that quaternion is more suited in application.third, The information of accelerometer output play an important role in the testing of flyer attitude.Flyer attitude is influenced by many factors,but it is difficult to establish an accurate model on them.Based on the study of effect of the information of accelerometer output factors on the testing of flyer attitude,the forecast method is presented,and BP model of ANN and calculation are set up.The data from the information of accelerometer output are employed to forecast flyer attitude,and compiled the related programme by MATLAB language ,and the analysis result demonstrates the model is effective.The new algorithms of GFSINS is presented in the paper. it is possible that the integrated navigation system will be used in theory, and the study in the dissertation have the practical significance and the application prospect.