Method for eliminating gyro constant drift in SINS

Aiming at the error of gyro drift at every start and the slow change in the strapdown inertial navigation system (SINS), a new method for eliminating the gyro constant drift on line is proposed. The gyros constant drifts in SINS can be measured and compensated by installing a monitor gyro. The principle of the method and the error analysis are presented. Simulation results illustrate that this method can measure gyro constant drift and its slow change, the error of gyro constant drift measured using this method is less than 0.02°/h. The influences of gyro constant drift on SINS are eliminated using this method; moreover the gyros constant drifts are compensated in navigation state, so the navigation precision of SINS is improved effectively.