Abstract: For attitude measurement of highspeed rotating ammunition, the traditional MEMS strapdown inertial measurement system has low measurement accuracy. Angular rate sensor cannot meet the test requirements in both range and accuracy. This paper proposes the concept and principle of semistrapdown inertial measurement and the realization method of MEMS semistrapdown inertial measurement, at the same time a semistrapdown MEMS inertial measurement device is introduced on the foundation of composition structure of semistrapdown. Through structural and functional description of power output bin, controldrive circuit installation bin, inertial information sensitivity bin and inertial information collection bin, this paper comprehensively expounds the realization method of semistrapdown MEMS inertial measurement. The device can provide stable test environment for MIMU and effectively inhibit influence in attitude measurement accuracy when measured vector is in highspeed rotating environment. The system provides a new idea for highspeed rotating ammunition attitude measurement and conventional ammunition guidance. It is valuable for engineering implementation.

Key words: ordnance science and technology, highspeed rotating ammunition, semistrapdown, active control, inertial measurement