FOG increase in harsh environments Accuracy of Northfinder

The present invention relates to a harsh environment, the method FOG north especially to improve the accuracy harsh temperature environment, according to the aspect of the present invention provides a method of FOG north to improve the accuracy in harsh environments, the Northern improve FOG accuracy method comprising the steps of: s1, measuring position N selected points, positions of N points using a fiber optic gyro azimuth angle measurement, wherein the initial position of the measurement point of the N points in the initial position of the measurement and the end of the measurement, to obtain N + 1 th measurements, measuring the position of two points adjacent angular interval of N = ml + 1; s2, the above-described N + 1 th measurements, the measured value is sequentially selecting a set of k , k of the measured values ​​within each group calculated azimuth; S3, several groups according to the azimuth angle obtained in the above step s2, the azimuth is calculated to give the desired final. The present invention is easy to operate, can suppress noise and drift at the same time, increasing the signal to noise ratio, north seeking to improve the accuracy, wide.