Aiming at different characteristics of the rate gyro error of GPS/DR navigation system in straight and turning situation
a fading memory gyro error compensation method based on road conditions is proposed.When GPS signal is normal
the gyro scale factor error is calculated in real-time depending on the road situation;the obtained scale factor error calculated in the normal case is used to compensate rate gyro error when the GPS is lost.After the gyro error of GPS/DR system is compensated
the extended Kalman filtering(EKF) method is put forward for fault-tolerant filtering.Good navigation precision can still be kept after GPS is lost in a period of time.