Abstract:

Aiming at the precision of the strapdown inertial navigation system (SINS) is influenced by oscillation errors, a method for Schuler oscillation errors restriction of shipborne SINS based on delayed alignment is proposed. Owing to the characteristics that the SINS can execute multiple sets of the navigation algorithm at the same time, the execution time of the second algorithm is relatively half of the oscillation error period delayed to the first algorithm through delayed alignment for half period. Delaying execution for half period makes Schuler oscillation errors in the second algorithm different from the first algorithm by a circumference ratio. The mean value of corresponding navigation parameters from the first algorithm and the second algorithm contains no oscillation errors, which improves the precision of the SINS obviously. Simulation and test results show that the method can restrict Schuler oscillation of shipborne SINS effectively.