Common methods to improve precision of gyroscope north-seeker is to choose high precision gyroscope

improve precision of transposition

increase the number of transposition

eliminate external disturbance by data filtering and so on.Most of the methods is pointed at certain error factor and less research on whole error characteristic of north-seeker.Through analysis on comprehensive error characteristic of gyroscope north-seeker

method is put forward to compensate the error of north-seeker based on the fast Fourier transform（FFT）.First measure the error of north seeker in a circumference

then by calculating coefficient of FFT to achieve error compensation on system grade of north seeker.The method is especially fitted to compensate structure error and remain error of constant drift.The production is verified that it can improve north-seaking precision over 3 times while keeping the gyroscope and transposition precision

and has good application value for engineering.