Improvement in Accuracy of Strapdown Inertial Navigation System due to Controlled Precessional Motion

An object with rotation limitations about one of its axes is examined. A model of angular motion of an object with regular precession, the axis of which is directed along the axis with rotation limitations, is considered. It is shown that autonomous estimation of the accuracy characteristics of the corresponding angle-measuring channel of the inertial measurement unit of the object's strapdown inertial navigation system (SINS) is possible due to the organization of controlled precessional motion with respect to two axes of the object that are free from limitations. The parameters of the controlled precessional motion are estimated by amplitude and frequency based on the acceptable level of methodical error of the SINS algorithms by the angular position. The influence of the amplitude component of the instrumental error on the accuracy of estimating the characteristics of the angle-measuring channel with rotation limitations is considered.