Title :
Nonlinear filtering methods application in INS alignment
Author :
Dmitriyev, S.P. ; Stepanov, O.A. ; Shepel, S.V.
Author_Institution :
State Res. Center of Russia, St. Petersburg, Russia
Abstract :
The problem of course alignment of inertial navigation systems is considered. Error equations of nonlinear character have been obtained at a considerable level of a priori course uncertainty. The algorithm for solving the problem of optimal estimation of the state vector described by nonlinear equations from linear measurements has been developed for the analysis of a potential alignment accuracy with the piecewise-Gaussian approximation of a posteriori density used. The results of the study of efficiency of various suboptimal alignment algorithms obtained by the use of the software developed are presented and discussed.
Keywords :
filtering theory; inertial navigation; nonlinear filters; piecewise-linear techniques; INS alignment; a posteriori density; a priori course uncertainty; course alignment; error equations; inertial navigation systems; linear measurements; nonlinear filtering methods; optimal estimation; piecewise-Gaussian approximation; state vector; suboptimal alignment algorithms; Acceleration; Accelerometers; Coordinate measuring machines; Covariance matrix; Density measurement; Filtering; Noise measurement; Q measurement; Rotation measurement; Time measurement; Velocity measurement;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
