机抖激光陀螺方波驱动方式的谐波分析

Harmonics analysis on square-wave driving signal of mechanically dithered RLG

针对方波驱动方式下机械抖动激光陀螺抖动幅度控制的问题,对机抖陀螺抖动的稳态幅度和驱动信号的维持时间之间的关系进行了研究。分析了某型机抖激光陀螺抖动机构的工作特性,通过谐波分析法证明了方波驱动波形在驱动效果上可以近似的由其一次谐波来等效进行分析,得出了方波驱动方式下抖动稳态幅度与方波驱动信号维持时间之间满足正弦函数关系的结论。分析了某型机抖激光陀螺实际驱动信号波形,证明了实际情况下上述结论的有效性;通过仿真对文中的结论进行了验证。

Since the dither amplitude of a mechanically dithered ring laser gyroscope should be controlled accurately, the relationship between dither amplitude and lasting time of square-wave driving signal was investigated. The dithering mechanism characteristics of a mechanically dithered ring laser gyroscope were analyzed. It was proved through harmonics analysis that square wave and its Ia harmonic wave were equivalent in driving effects. It was found that the relationship between dither amplitude and lasting time under square-wave driving signal accorded with sine function. The practical waveform of driving signal was analyzed which proved the validity of the conclusions, and the simulation was made which also verified the conclusions.