Abstract: From the view of system, the paper analyzes some special problems of rate bias laser gyro. The problems include modulation and demodulation of the output of rate bias triple axis laser gyro, the choice principle of the biased rate, rotating back acceleration of rate bias platform and the rotating back position's effect, etc. In addition, through comparing between two plans of navigation, the paper puts forward a plan named ‘navigation project based on rate bias platform’ which is able to increase the accuracy of navigation system or reduce the design demand. The article builds a series of basic design criteria of rate bias laser navigation system, providing certain reference for the system design.

Key words: rate bias, laser gyro, system analysis, navigat ion system