Abstract: A scheme of three-position-north-seeking with one RLG was presented to determine the benchmark for initial-alignment of the ground-to-ground tactic missile. The north-seeking error was analyzed and the method to reduce the error was proposed. The techniques mentioned above are useful for developing the laser gyrocompass north-seeking equipment satistymg the requests of initial-alignment for ground-to-ground tactic mis- sile’s launch.

Key words: instrument and meter , laser gyroscope , gyrocompass , north-seeking , ground-to-ground missile , initial- alignment