METHOD FOR DETERMINING NAVIGATIONAL PARAMETERS BY MEANS OF A STRAPDOWN INERTIAL REFERENCE SYSTEM

摘要

The invention relates to data processing in strapdown inertial reference systems. The inventive method involves the parallel computation of the set of matrixes of direction cosines between bound and navigational coordinate systems according to the same readings of accelerometers and angular velocity sensors. The inherent navigational parameters having different frequency errors are calculated for each computing matrix. Each computing matrix has an individual control law (damping, correction), and the errors of calculation thereof also have a different frequency spectrum according to the carrier trajectory modes (strong maneuver, weak maneuvering and cruising unmaneuvering trajectory), on which the strapdown inertial reference system is mounted. The navigational parameters for each computing matrix of direction cosines are transmitted to the inputs of a master-filter unit, and the optimal combination of navigation solutions according to the frequency range of errors thereof and the carrier trajectory parameters is formed. Said invention makes it possible to increase the accuracy of calculation of the output navigational parameters of the strapdown inertial reference system.