The problem of increasing the accuracy of the calibration of Strapdown Inertial Navigation System (SINS) is considered. Calibration is performed on precision motion simulator. Method of determining sensor errors (gyroscopes and accelerometers) using output signals of error model of SINS is investigated. Entrance signals of errors model of SINS are errors gyroscopes and accelerometers. The method is based on solving the inverse problem, it is determination of errors gyroscopes and accelerometers using output signals of error model that are determined experimentally during calibration. The algorithms are proposed for sensor errors, the algorithms efficiency is analyzed. Procedure for calibrating the sensors using output signals of error model of SINS is developed, it is with correction system by precision motion simulators signals.