Aiming at status that navigation precision is affected by FOG error parameters

and the system precision is difficult to be further improved because of lower calibration precision of gyro zero-offset

scale factor and installation error angle by the traditional open-loop calibration

a novel FOG closed-loop calibration method is proposed.The FOG zero-offset scale factor and installation error angle are calibrated in compass alignment and navigation process of SINS.Simulation environment is built by Matlab.Compared with the traditional open-loop calibration method

simulation results show that the FOG closed-loop calibration method can effectively improve precision of FOG calibration.