Research of air-launched guided weapons SINS transfer alignment

SINS transfer alignment based on the Speed+Azimuth matching is studied.The causes for the azimuth measurement bias as well as its relationship with the azimuth misalignment angle are firstly introduced.Calculation method about azimuth misalignment angle of the primary sub-INS is derived,and azimuth misalignment in the simulation experiment is estimated.Based on this analysis,we established the transfer alignment Kalman filtering equation,and simulated the transfer alignment of missile carried SINS in VC + +.Through the simulation we found that the accuracy of SINS with Speed+Azimuth matched is controlled within 0.05 °,which can meet the requirements for initial alignment accuracy of air-launched guided weapons.