Abstract: The parper describes the experience and present status in developirg ring laser gyro at abroad. Successful results have been obtained in research and development, which are based upon the error analysis and their compensation methods. Mechanical dither for frequency biasing has some adventages and has been applied widely, but it can not meet the accuracy requirment in inertial navigation. Recently at abroad rate-biastcchnique is under development, it can reduce the random error oi RLG significantly and compensate its bias drift rate. The adventages of this technique are discussed in the paper.

Key words: ring loser gyro, lock-in control, rate-biastechnique