IN order to enhance overall precision of the LSINS and meet the precision guidance performance of weapon platform (airplane), algorithms of LSINS are systematically and throughly studied.

To three-axis laser SINS, besides the conning motion introduced by carrier, there are conning motion introduced by dithering of three-axis laser gyro.

It was shown that the conic error can be compensated by two-sample iteration algorithm with high-frequency vibration. The precision of SINS can be improved by coning compensation.