From Platform to Strapdown Gyro Systems: External Disturbance Filtering for SINS Initial Alignment. The Results of its Application

摘要

The paper considers the concepts of analytic filtering with the use of principle of external disturbance reduction implemented in platform systems of angular orientation. The paper also describes an approach to determination of initial orientation parameters with the use of a physical principle of alignment. This principle implies realization of analytic dependencies in SINS navigation parameterization algorithm. These dependencies imitate the operation of an azimuth gyroscope and a horizontally stabilized platform. The results of field tests are presented. They justify the functionality and the effectiveness of the algorithm. Application of filtering results in an increased accuracy of SINS initial orientation especially when SINS are operated on ground mobile obj ects under the influence of angular vibrations, angular oscillations and a random change of the object casing angular position.