Fast Alignment Algorithm Based on Inertial Frame for Shipboard SINS
Abstract：In order to satisfy the requirements of rapid and precise alignment for shipboard strapdown inertial navigation system（SINS）, the fast alignment algorithm based on inertial frame is proposed. The third order leveling loop is used for leveling alignment, then the projection of the gravitational acceleration in the base inertial frame is calculated directly and smoothed based on the average algorithm by weigh- ting. According to the gravitational acceleration presents the coning motion in the inertial frame, by using the information of the gravitational acceleration which has been smoothed, fast alignment for shipboard SINS is accomplished. The alignment method is simulated and a mooring experiment is used to validate the feasibility of the alignment method. Experiment results show that, the precision of the fast initial alignment algorithm achieves the medium navigation accuracy requirement in 6 minutes.
Keywords：SINSfast alignmentthe third order leveling loopaverage algorithm by weighting
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 49-51 )